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Pro Tips for Spray Painting

Pro Tips for Spray Painting

Here’s a great workshop technique from editor Gerry Yarrish’s workshop. Over the years, the products may have changed but today, painting your model airplane with “rattle can” spray paint is a less expensive alternative than using an air compressor and an automotive touch-up gun.

When you start building models that have formed plastic or fiberglass parts such as the engine cowl, wingtips, or wheel pants, you are faced with the additional task of painting them to match the rest of your model. Spray paint is a convenient and simple way to finish those formed parts, but unless you take the time to prepare them, your new paint job can peel or chip away after only a few flights. Here’s a surefire way to achieve a long-lasting, attractive paint job with a minimum of effort.


Basic things you’ll need include 150- and 220-grit sandpaper, vinyl electrical tape and paper masking tape, a sharp hobby knife, paper towels and denatured alcohol. You’ll also need masking paper (wrapping paper or doubled over newspapers) and an automotive tack cloth. Whenever possible, use the same brand of paint, primer and clear coat.


1. The first step is to wash your hands to remove any body oils from your fingers before you begin sanding your part (here, an engine cowl for a Super Decathlon). Sand with 150-grit paper, and remove all the parts’ surface gloss. Get into all the small corners, and smooth the inside edges of any openings. Wipe off the part, and check to makes sure that there aren’t any shiny spots. Then sand the cowl again with 220 sandpaper. Sanding the part gives the primer something to “bite” into and helps the finish adhere to the part.


2. Wipe off the cowl again and then use denatured alcohol to degrease its surface. Even fingerprints can cause the finish to peel.


3. Before you spray on the primer, make a hook out of a wire coat hanger to hang the part on. Shake the can vigorously until you hear the little mixing ball rattle, then apply the primer in several light mist coats. Allow each coat to dry for a minute or two before you apply the next. While spraying, hold the can about 10 to 12 inches away from the part.


4. After the part has dried for a few hours, wipe it down with a tack cloth to remove any dust from the surface. When handling the part, try to hold it from the inside to minimize finger marks on the outside.


5. Hang the part again, and start applying the base coat—in this case, high-gloss white. Whenever you paint a multicolored part, always start with the lighter colors and add the darker on top. Also, if you paint a single, bright color such as yellow, orange, or red, apply a white base coat to the part first; this really makes the color coat shine.


6. Prepare your masking tape by cutting the electrical tape into thin 1/4-inch strips. The upper red portion of my engine cowl has two rounded front corners that require the masking tape to be bent around them. Thin strips make this possible. Vinyl flex tape can also be used, but electrical tape is less expensive if you are doing a lot of masking and it is readily available at the hardware store.


7. After the paint has dried overnight, place the cowl on the model, making certain it’s positioned correctly relative to the spinner and firewall. Use a straightedge to draw light pencil guidelines so the painted portions will match the trim design on the fuselage.


8. Using the guideline as a reference, apply the electrical tape to the outside or “masked” side of the guideline. Do not stretch the tape along straight lines, and only stretch it lightly along curved edges. If the tape is stretched too much, it will lift before you have finished painting the part.


9. Check the tape to make sure it’s correctly positioned. If you don’t like it, remove it and reapply it until it’s right.


10. Mask the rest of the cowl with paper masking tape. Begin along the electrical tape, and work away from the paint edge until you have about 2 inches of masked area.


11. Use paper to mask the rest of the cowl, and make sure everything is completely covered. Use your thumbnail to burnish the electrical tape down tightly. Double-check the curved edges to make certain the tape hasn’t lifted out of place.


12. Cover your work surface with paper, and prop up the cowl with a couple of paper cups to lift it from the bench. This will prevent the paint from “gluing” the part to the paper and marring the finish. Now apply the trim color to the unmasked portion of the cowl. Apply the paint in very light mist coats, and allow it to dry for a minute or two before you apply more paint.


Here, you see the first mist coat. Note that it does not completely cover the white base coat. Apply several more light coats until the white is no longer visible.


This is what the red looks like after six or seven mist coats have been applied. Now let the paint set for about 10 minutes then carefully remove your masking tape.


13. After the paint has dried overnight, apply your trim graphics. Here, I am applying the black star to the cowl. Note the small triangle of white I added to the top point of the star. This little trick makes it unnecessary to mask off the red portion where the star would rest.


14. Here, I am applying the two black pinstripes that finish the trim design. Once you have finished with all the trim work, wipe the cowl with a tack cloth and hang it on the wire hanger again and apply several light clear coats to seal everything into place. Allow the clear coat to dry overnight, and you’ll be ready to attach the cowl to your model.


Here is the finished cowl on the Super Decathlon. Painting with spray cans is very easy, and the results are impressive if you take the time to do the job right. A clear coat really makes the finish shine and seals all the trim edges at the same time. Give Rattle Cans a try; you’ll love the results this spray paint technique provides.


Add a Comment
  1. should you use flat paints instead of gloss if you plan on a clear coat.

  2. how do you go about matching colors for Hangar 9’s Ultracote pearls? what kind of paints work best to keep from spider cracking?

  3. I have used rubber gloves in the past to keep me from leaving finger prints behind.

  4. Very informative. I have always sprayed to much and the paint would run and I would have to sand and start over.

  5. What’s the best way to seal balsa and get rid of the grain?

    1. Years ago I used nitrate or butyrate dope mixed with a little aluminum powder, thinner and lots of talcum powder mixed to a thick consistency like runny yogurt. It is easy to sand and the aluminum color shows up any flaws excellently. But now I mix some Podge (a water based sealer glue from Michael’s or any craft store) then add quite a bit of DAP spacking compound (pink stuff that turn white when dry) and add water to mix, again medium consistency. Sands easy and is light weight. Just experiment with the amounts in the mixtures. Both work well.

    2. Thin some Zpoxy finishing resin with denatured alcohol. Cut 3/4 ounce (or lighter) fiberglass cloth 1″ on a side larger than the area you are sealing. Apply the cloth to the balsa by brushing the thinned Zpoxy finishing resin into the cloth. When the entire area is brushed down absorb any excess by blotting the surface with a paper towel. Once cured lightly sand it with 220 grit sandpaper. Thoroughly clean the area and reapply undiluted Zpoxy. Once cured you will need to wet sand with 220, 320, 400, and 600 grit sand paper. You may need to apply 2-5 coats of Zpoxy sanded in between coats to get the smooth, laser-like finish you desire.

  6. I always seem to have problems with “orange peel” when I use rattle cans. I’ve tried a bunch of different techniques, used very light coats, sprayed at warmer or cooler temperatures. Never seem to get that glassy-smooth result.

    1. Orange peel – most economy paint cans have really bad spray patterns. I have never used the brand in the article, but is clear the spray pattern is excellent. And if you should
      come upon a good spray nozzle, clean it well and save it !!

  7. I use timyia tape instead of having to make cuts in electrical tape and has a better tack. have not seen Coverite paint for years, Aerogloss and colors a limited. Watch your coat thickness can build weight fast! 3″ blue painters tape from Harborfreight is faster to mask with, ultra smooth sand between coats with 400 grit removes orange peel and overspray.

  8. The only thing I would add, is that after you have your basecoat down, and all the masking for color done, spray a quick coat of the basecoat up against the masking – when dry start shooting your color. Guaranteed not to bleed the color coat under the tape!

  9. Might be time to revisit this article as the paints listed are no longer available. Even Top Flite paints are gone.

  10. What is your recommended best paint for glow
    Type engine models. Years ago I used K and B
    Epoxy paints and they were great. Always concerned
    About resistance to glow fuel. I understand that
    Epoxy paints are no longer available.

    1. Not true, have you heard of Klasskote paints? That stuff is as good or better than the old K&B or HobbyPoxy paints. Here’s a link to the site with R/C model info. Check it out. http://www.klasskote.com/re-model-crafting-epoxy-paint

    2. Hey fellas Liquitex Paints makes water based enamel paints. Perfect for foam … Ck em out.

  11. Paint works better when it’s warm. When using rattle cans, place the can in warm tap water before painting. This warms the paint and increases the pressure inside the can. Be careful – not too hot! You don’t want the can to explode! Thoroughly wipe off any water before spraying.

  12. A suggestion, try not to use newspaper for masking, it contains a large amount of paper dust and causes extra sanding.

  13. And the most important thing when finished using spray cans is to invert the can and spray for a few seconds to clear the spray nozzle,otherwise the the nozzle will be blocked with paint when you want to use it again

    1. To ensure free flowing nozzles, I remove them from the can following a quick inverted blast and store them in a jar filled with solvent. This way, they work perfectly every time.

  14. Some advice on painting foam airplanes would help, I’m painting a GWS Texan,and tried some acrylic rattle cans, but they were melting the foam, so I’m brushing on water based acrylic from the craft store. Good enough for a foamy!

  15. Krylon short cuts spray paint works great on foam airplanes

  16. While there is a few good tips on painting here…it does now address the real issues we have with painting/matching iron on coverings today.
    Color match?? Paints that are available? All of these paints in the article are gone. What about breathing protection for modern paints?
    We need an article that is about current painting products and processes.

  17. Great tip to use the stretchy electrical tape! For years I have stripped masking tape to 1/4 inch and done it that way. Getting it to follow tighter bends is always fun. This should be an improvement.

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