How To Correctly Prep Exterior Trim For Painting - Eco Paint, Inc. (2024)

Knowing how to correctly prepare exterior trim for painting, will ensure final paint coating it's lasting protection & quality. Listing all acceptable steps preparing trim for upcoming paint coatings, which benefit outside trim in many ways.

Understanding paint on wood trim is the first thing to fail, it's proper prep is the utmost importance, for lasting adhesion, & paint protection.

Special care needs to be dealt concerning trim boards, laying out what you need to be aware of, so that paint lasts longest time possible.

Most outside wood trim is found around windows, doors, fascias, & corner boards. Also exterior trim is found with skirting boards, bats. Typically painted a contrasting color, different than main field color.

How To Paint Exterior Trim Like A Pro

Outlining proper preparedness, painting your exterior trim like a Pro

To professionally paint trim outside sufficiently, first steps listed below must be followed.

Guiding you to clean, inspect, scrape, caulk, fill, and prime all areas needing your attention.

  • Pressure wash exterior siding & trim
  • Inspect exterior trim
  • Scrape outside trim showing failure
  • Caulk all exposed trim outside
  • Fill all holes, gouges, intentions
  • Prime, scraped trim, or bare wood

Pressure Wash Exterior Trim

First, let me say pressure washing should not be trying to peel paint. Thinking you can skip an important next step, as I will explain further in article.

. keeping spray tip at least 2' away from surfaces, you are only trying to remove any dust, dirt, or grime. No telling how many birds have bombarded your siding over the years. All of which needs to be cleaned.

Pressure washing is probably the most enjoyable, easiest step preparing your exterior trim. Similar to washing your new car or truck in a driveway. Never having to worry breaking a sweat. Also fun, but besides not getting too close, you'll want to work from the top down.

If You Don't Have A Pressure Washer, Can Always Rent One

Even if you cannot see this dust, dirt, or bird droppings, it's there. As giving you a prime example. Have you ever gone to the car wash, rinsing off your fairly clean car or truck, seeing all the dirt coming off? Same goes for your exterior siding & trim.

Giving your outside surfaces a quick rinse, is like having a clean slate or canvas to work with. Similar to an artist's cleaned canvas, but only on a grandeur scale.

Inspecting Exterior Trim

Well, you've been actually inspecting trim, while you've been pressure washing. Seeing any troubled areas. Where paint is really peeling off, or worse, visibly witnessing decay, mold, or mildew.

Visibly Inspect Trim For Problem Areas

Key tip is allowing exterior to properly dry, 24 - 48 hours before any hand scraping begins.

Reason for this wait is dried paint is much easier to scrape than wet. Less likely to damage trim even more, scraping, or wire brushing old paint, when wood has dried back out.

Using a 5 Way painter's tool, you can go around as many areas as you can, tapping on paint. If hearing a hollow sound under paint surface, even though paint is still intact, chances are, you have air pockets. And this leads to the next step, preparing your trim like a Pro.

Scraping Old, Failed Paint

Do I really need to scrape paint before painting trim?

Generally speaking No, you don't. Only remove all old paint that is showing signs of failing. These signs again are paints not properly adhering, cracked, bubbled, blistered, or peeling. As this is one of the main reasons paint fails.

I know scraping paint is not on your highest priority of things to do, but it is at the utmost importance, if you want your new paint coating to last. Matter of fact, paint that is currently lifting up, or will lift up in the next 6 months, will continue to do exactly that.

Basic Hand Scrapers Work Well

Scraping off old, cracked, failed paint off of exterior trim is a must. Just as it is, hearing air pockets underneath where you've inspected, testing painted surfaces.

As you scrape paint off your trim, just imagine it could be worse. Thinking you could be scraping paint off of a ship, with insurmountable areas to scrape. So scraping paint off of your trim is a lot less, but has to be done, just the same.

Whether or not you have a fresh new paint coat. Even does not matter what grade or quality of paint you're using. Old failed paint can cause even the best lifetime paints to fail, if failed paint not properly removed.

Using a wire brush works well in many areas of trim. Hard to reach surfaces, or grooved trim pieces, a wire brush is the answer.

Painting Exterior Trim That Is Currently Peeling

One of the main reasons you've decided painting exterior trim that is currently peeling, knowing it's only going to get worse, not better. Not only does all failed paint need to be scraped, but is good rule of thumb to ascertain the reason causing it in the first place!

Hopefully, you don't have a lot of paint to scrape, but every home is different.

Trim is notorious finding failed paint for a number of reasons. Painting exterior trim that is currently peeling will not last the duration of paint's warranty. Removing failed paint is extremely important for new paint's proper adhesion.

Caulking All 90 Degree Cracks

Just about homeowner's primary consideration of exterior's proper preparation for painting trim, is caulk and sealants. 9 times out of 10 every exterior paint job includes some amount of caulk, especially for trim.

All You Need Is A Good Tube Of Paint-able Caulk & Caulking Gun

Removing old dried, cracked out caulk is your first step. Following by caulking with a high grade caulking sealant. Caulk all cracks, 90 degrees, where trim board meets another. This keeps out water penetration, as paint just wont bridge these gaps.

Using a high grade latex paintable silicone sealant, we either use Sherwin-Williams® 1050 orSherMax Urethanized Elastomeric Sealant is designed for masonry, but works well on trim & siding, where any movement might take place later.

Filling Holes, Gouges, Indentations

If you have holes from woodpeckers, gouges from a lawnmower hitting bottom edge of trim board, or a golf ball making a dent on the side of your house, listen up.

These imperfections must be cared differently than filling with caulk. What best fills gouges, or indentations is Crawfords® Exterior Spackle.

Reason for this is not only does it dry quickly, but dries a flat finish. Putting on a new satin exterior paint will eventually go to a flat finish. Crawfords® Exterior Spackle will never show or stand out being a different finish years to come, as finish coats age.

Allowing Exterior Spackle to dry, normally within an hour or less, sanding is very easy, with a medium to fine sanding block. After sanding, all your exterior trim is ready for the final step in preparation.

Prime Bare Wood Trim

You're almost done preparing exterior wood trim for painting. Applying a high bonding latex primer will do several good things for wood trim.

Have A High Bonding Exterior Primer?

Not only will primer appropriately seal wood trim, but allow final paint have a better surface to grab, for proper adhesion.

Top Exterior Primers For Trim

Sherwin-Williams™ Extreme Bond Primer

For surfaces that require a greater degree of adhesion than our standard primers can offer, Extreme Bond Interior/Exterior Primer is up to the challenge. Designed for coating hard, glossy surfaces like tile, glass panels and plastic piping with minimal surface preparation. Can be tinted and is compatible with a full range of finish coat products.

KILZ® General Purpose Primer

KILZ® GENERAL PURPOSE EXTERIOR is a fast-drying latex primer and sealer, specifically formulated for outdoor use. It minimizes problems caused by surface texture and porosity differences. It’s ready to brush, roll or spray and can be topcoated after one hour with latex or oil-based paint.

Glidden™ Gripper Primer

Gripper Interior/Exterior Primer & Sealer is a premium acrylic primer and sealer designed to meet the variety of challenges experienced in the residential, commercial and multi-family markets for a multi-purpose primer. This fast-drying, all-purpose, bonding primer and sealer is suitable for interior or exterior application with its excellent adhesion to a variety of surfaces. Ideal for use on properly prepared interior or exterior wood, masonry, plaster, wallboard, cement, brick and stucco.

PPG™ Pittsburgh Primers

Choose from a range of professional-quality interior and exterior acrylic latex primers that are quick-drying, feature excellent adhesion and have great hiding and sealing qualities.

Simply, any bare wood requires primer first. Reason is exterior primers bond to wood much better than typical exterior paint coatings. Also understanding your standard exterior paints grabs to primers much better than to bare wood.

Knowing how to paint exterior trim like a Pro, requires following tips listed above. Preparing your surfaces withstanding any weather comes it's way.

Masking Trim

Masking certain surfaces outside before painting exteriors is indeed a step, but not for trim. Reason masking trim is not a suggested step prepping your wood for painting, is how an exterior painting job is actually completed.

Have a 3M hand masker?

When painting exteriors, masking windows, roof, & concrete, spraying field or body first, it's not only good, but quicker to over-spray on trim boards themselves. Painting sides of trim the field or main color, coming back, front facing trim with it's different color.

Therefore, not only this saves time, but giving your fascia trim an additional coat during this overall process.

So masking trim is not a preparation step painting exterior trim, but is a very integral part painting complete exterior. In that painting trim is typically done by brush & roll.

Caring For Your Exterior Trim

These important steps preparing exterior trim coincide, painting complete exterior homes as well. Keep this in mind though; If trim is showing age, probably your entire house needs a fresh coat also. Additional information can be found as to, most exteriors painted, trim also siding is painted same time.

Need To Replace Trim?

Summarizing how to correctly prep your exterior trim for painting involves a few key steps or processes. Cleaning off all surfaces, gives you a clean slate to work with.

Trim Replacement

If fascia, corner boards, skirting boards, or bats too damages to repair, guess what? It's much easier just to replace them.

Followed by giving a good bird-eye view of wood trim's integrity, having a good, solid substrate. If any areas need attention, either replace trim boards, or scrape old flaking paint off, filling any mil thickness differences.

To Summarize Prepping Exterior Trim For Paint

Sanding filler, caulking edges where trim meets another substrate, allowing to dry. Another key step preparing trim for paint is priming.

Priming all bare wood, caulking, fillers, sealing trim, allowing primer to properly dry. Once primer has dried, trim is ready repainting exterior trim, looking brand new.

However, in most cases trim does not need replacement. Peeling paint will give the appearance trim boards are baked and done with. So giving careful attention to your trim on an ongoing basis is the first important step, caring for your exterior trim.

Hope this helps you with your exterior trim, & if so please like, share, comment, and/or ping below!

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How To Correctly Prep Exterior Trim For Painting - Eco Paint, Inc. (2024)

FAQs

How do you prepare exterior trim for painting? ›

Preparing Exterior Trim for Painting, Step-by-Step

Start by scrubbing off all dirt and chalking paint with a scrub brush and a solution of trisodium phosphate (TSP). Rinse the trim thoroughly, and allow it to dry completely before preparing the surface for primer and paint. Get Free Bids Now!

Do I need to prime exterior trim before painting? ›

It's important to prime bare exterior wood prior to painting because it seals the grain, prevents bleed-through and improves paint adhesion. It's just as important to prime other materials, such as stucco, metal and concrete, for similar reasons.

Should you sand trim before repainting? ›

Sand Trim Between Coats for an Ultra-Smooth Finish

And if you don't sand the surface smooth between coats, the finish may have a grainy texture. For a smooth finish, sand the trim before applying each coat of paint.

How much can you get scraping before painting? ›

How much scraping is enough? As a standard rule of thumb, when there isn't any more flaking you're in good shape. Remember, your paint is going to bond to the surface and if that surface is loose and flaky, then the new paint has nothing to cling to.

What is the best paint finish for exterior trim? ›

Semigloss: This shinier sheen is easier to clean, more durable, and more moisture resistant than a satin or eggshell paint. Best for trim, particularly on windowsills, which take the brunt of the weather.

Do you need primer on exterior trim? ›

Especially oil primers for an already painted siding or trim is a BIG NO! If the entire surface is peeling and must be sanded down to bare wood, then a coat of primer is necessary. However, It is best to use a proper 100% Acrylic primer if possible with the exception of the certain bleeding type of wood.

Is a second coat of primer necessary? ›

Depending on how strong or bold the previous color is, it may be necessary to apply more than one coat of primer. However, it is not necessary to over apply the primer with so many coats. As long as the primer applies uniformly over the previous color, then one or two coats should be sufficient.

What happens if you don't use primer before painting? ›

If you skip priming, you risk peeling paint, especially in humid conditions. Moreover, the lack of adhesion could make cleaning more difficult months after the paint has dried. You may find the paint wearing off as you're trying to wipe off dirt or fingerprints.

Can you just paint over painted trim? ›

If your trim is in good condition and you just want to do a quick change to the color, you can simply clean it, tape it off, and paint based on what's already on the trim (oil-based over oil-based, latex over latex).

How do you prevent brush marks when painting trim? ›

Go with the grain. In any painting project, trim included, paint with the grain of your wood rather than across it. This ensures the smoothest finish. Cut in first, and then paint the middle.

Can I paint over existing trim? ›

First, sand the trim and doors down to break through the polyurethane. What that means is that you want to sand the “gloss” off of the surface. Second, apply a shellac primer over the surfaces that you want to paint. This makes sure that the paint is going to adhere to the surface properly.

Is it better to paint trim with a roller or brush? ›

For small, detailed work such as wooden trim or the edges of ceilings and door frames, a brush is probably your best bet. A roller can leave messy strokes along with these areas, but a good brush will lay down just the right amount of paint without leaving ridges or smears.

How much should you sand before painting trim? ›

Prepare the Trim

In kitchens, use a sponge and soapy water to remove grease buildup from the trim. Scuff-sand the surface of the trim. Start with coarse, 80-grit sandpaper and then move to less-coarse 100- and 120-grit. If the trim is new, use only 120-grit just enough to remove any sheen from the surface.

What brush is best for painting trim? ›

When painting trim or baseboards, the paintbrush you use can vary based on the size of your baseboards and the type of paint you're using. Typically, a 2 or 2.5-inch angled brush works just fine. Particularly when using latex paint, it's best to paint your baseboards with a nylon or poly-nylon brush.

What is the best tool for scraping paint? ›

Best Tool for Scraping Exterior Paint - YouTube

Do I need to sand before painting exterior? ›

Sanding the exterior walls is necessary to provide a real mechanical bond between the coats of paint. If you don't rough up the surfaces sufficiently, your paint job may look good when you walk away from it, but in just a few years, the paint starts to show all sorts of errors.

What is the easiest way to scrape paint? ›

Scraping paint is usually done with a wire brush, a paint scraper, or a combination of both tools. This can be a tedious and time-consuming process. If you want, you can limit your efforts to the areas with imperfections and then sand to even out the surface.

Can I paint over old exterior paint? ›

If the existing paint is of the same type and the wall is in good condition, you can go ahead and paint without sanding. However, when it comes to wood, you may have to sand for proper adhesion. However, you can also skip the sanding process and make do with a primer.

How do you clean exterior wood before painting? ›

To prepare previously painted wood, strip off cracking, flaking, or chipping paint, sand the surface with 180-grit sandpaper, remove the dust, and wipe with a damp sponge.

What kind of paint to use on exterior wood trim? ›

But despite the shade you ultimately select to heighten your home's curb appeal, there's only one real option for the finish. It has to be semigloss. The same goes for exterior trim. Semigloss paint gives you a smoother surface than lower-sheen finishes and has a degree of shine, providing a visual contrast.

What type of paint do you use on exterior trim? ›

Normally, semi-gloss paint is the best choice for trim work, since high-gloss paints are so shiny that they highlight imperfections. For large areas of the home covered by siding, less glossy paints are a better choice.

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