How to Paint Interior Trim with a Paint Sprayer

Learn how to paint interior trim with a paint sprayer to get a super smooth finish and great results in any room in your home!
Project Type
FLEXiO 3500 Sprayer
FURNO 500 Heat Gun

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Painting interior trim really ties a room together in any home. Especially if you find a color that coordinates with your doors, cabinets, and walls. Painting your trim might sound like tedious work, but a Wagner FLEXiO 3500 with the Detail nozzle will help you get it done with a nice, smooth finish, plus you’ll have fun in the process.


using a Flexio 3500 to spray trim outside


freshly painted room in the color blue, clean room with a chair and side table on the wall with the front door to the house showing


using a Flexio 3500 to spray trim outside

Spraying Trim on Sawhorses

If you haven’t installed your trim yet, painting it is really easy because you won’t have to mask any walls or bend and stoop while painting. Just lay it down horizontally on a pair of sawhorses, spray the trim, and install it once dry.

Step 1

using a Furno 500 to dry up putty used to fill holes

Repair Any Dings or Holes

If your trim has already been installed, you’ll have a few more steps to do. Start by repairing any holes or dings with wood putty. Allow it to dry for the recommended time. You can also use a Wagner heat gun to speed up the process.

Step 2

person sanding the trim inside of a house so the paint can stick better

Sand the Trim

When the putty is dry, sand the filled nail holes smooth using medium grit sandpaper. Then scuff sand the rest of the trim to remove any gloss so the new paint will stick better.

Step 3

caulking the seams on the trim preparing for paint

Caulk the Gaps

Wipe away the dust and clean the wood thoroughly with a wet rag or tack cloth. Also be sure to caulk any gaps between the walls and trim using latex caulking.

Step 4

person hanging up masking tape to protect the house from paint overspray

Hang up Masking

Now it’s time to prepare the room for painting. Grab your plastic masking and painter’s tape and cover anything you don’t want painted, including the walls and ceiling around the trim. Lay down drop cloths to protect your floor and any furniture that might still be in the room.

Step 5

flexio 3500 and the detail finish nozzle sitting on a counter ready to be used for painting the interior of a home

Prepare the FLEXiO 3500

Now for the fun part…spraying! We recommend using the Wagner FLEXiO 3500 paint sprayer, which is great for a wide variety of projects, including painting trim.

The FLEXiO 3500 comes with two nozzles: an iSpray nozzle for broad surfaces and a Detail nozzle for fine finish work like painting trim.

Spraying is much faster and easier than a brush, plus it’ll give us a nice, smooth finish with no brush marks.

Step 6

testing spray pattern out on cardboard before spraying the interior walls

Test Your Spray Pattern

Choose your favorite paint color and pour it along with Wagner Paint Easy into your sprayer material cup. Popular color choices for trim are white or black, but you can have fun choosing the best color for your room.

Once you’ve adjusted the paint flow and air flow and tested your spray pattern on a piece of cardboard, you’re ready to start painting.

Step 7

person spraying trim with the flexio 3500 paint and stain sprayer indoors

Spray the Trim

Adjust your Detail nozzle for the direction you’ll be spraying in, then start at one end of the trim and spray along its entire length. Keep the sprayer steady and about 6 inches away from the trim. Be sure to keep the tip of your sprayer parallel with the trim while you’re spraying.

Step 8

person standing on a stool painting up high in a room with a paint sprayer flexio 3500

Spray Side to Side or Up and Down

Adjust your nozzle for up and down spraying or side-to-side. Wipe the spray tip periodically with a wet cloth to prevent paint build-up on the nozzle. In most cases, even the widest trim can be covered in one pass.

Step 9

person taking the masking down after painting

Remove the Masking

Remove all of the painter’s tape and masking when the paint is still slightly wet so that the tape doesn’t pull off any trim paint.

Step 10

freshly painted room in the color blue, clean room with a chair and side table on the wall with the front door to the house showing

Enjoy the Room!

Enjoy your transformed room! The painted trim really pops and ties in nicely with the color of the walls. Plus, this was so fun that it didn’t even feel like work!

Step 11

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