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Model Airplane Spray Painting Made Easy

Model Airplane Spray Painting Made Easy

Here’s a great workshop technique from editor Gerry Yarrish’s workshop. 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 or a HVLP (High Volume, Low Pressure) rig.

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.

STUFF

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. Here, I am using Coverite 21st Century white, light red, white primer and gloss clear.

SANDING_stp2a

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 my Giantscaleplanes.com 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.

2ALCOHOL

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

3PRIMER

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.

4TACK_CLOTH

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.

5WHITE_PAINT

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.

6tape_cut

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.

7LINE_DRAW_02

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.

8MASKING

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.

9MASKING

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.

10MASKING

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.

11MASKING

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.

12RED_PAINT

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.

12aRED_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.

12bRED_PAINT

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

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

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.

Finish

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.

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20 Comments

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  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.
    Thanks

    1. I was told a run is a near perfect paint job 🙂

  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.

  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 !!

    2. Try warming the spray can under hot water for a few minutes… this will help reduce orange peel… you’ll see the paint flow much better when the paint is warmed…

  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. When painting over wood surface use filler primer,it’s seals all pin holes and will not soak in.also called sandable primer. For stripes use pin stripe tape,comes in different sizes,paint will not bleed through.

  10. Soaking the spray can in hot water prior to spraying reduces the viscosity of the paint and helps eliminate orange peel. It also increases the pressure in the can. Do not boil the water with the can in the pot and wipe off the can before spraying.

    Orange peel can be eliminated by wet sanding with soap and water with 600 – 1000 grit paper, assuming you have put enough paint on in the first place.

    A clear coat can be applied to a wet sanded and tack ragged surface

  11. Been using spray-can paints (SCP) for over 55 years. Here’s what I’ve found: Results are still inconsistent. You’d think by now SCP would be much better. As Gerry has shown, SCP do work…sometimes. So, what to do? If you prefer doing the job “right,” invest in an airbrush or detail-gun setup. Then practice, practice, practice. You’ll get so proficient that you’ll have lots of “friends” wanting stuff painted! Remember, when spraying any kind of paint, use a filtered air mask and plenty of ventilation.

  12. In my experience, it is extremely difficult to get a glass-smooth finish using rattle cans unless you sand or wet sand with fine grit media after the paint is thoroughly dry. The “dust nibs” that accumulate after spraying are virtually impossible to avoid unless you are spraying in an industrial clean room. I use Mirka “Abralon” 3″ foam-backed sanding pads, available from 500 to 3000 grit. If you really want that mirror finish, you have to take a few extra steps to get there.

  13. Fine for electric powered aircraft but I an not aware of off the self spray can paint that is “fuel proof” for fuels containing 10-20% nitro. Are there any?

  14. The rattle can companies try to idiot-proof their product by mixing the paint thicker to avoid runs. It is therefore too thick to atomize into a spray but rather blows out in droplets. When these droplets hit the surface they push out a small crater. This is where the orange peal look comes from. If you want a good finish, get a good siphon touch-up gun and spray automotive paint. Every ones painting style is different so you will have to experiment with the viscosity until you get it to match your style of application. Many mixing companies can match a paint to your covering. Just take a small scrap they can run in their computer system and you get a perfect match. Another thing that effects the color is the base coat. Always use a white base and your top coat will be as it is supposed to be. Paint adds weight faster than you realize so use single part paints so you don’t have to put on any clear.

    1. For fuel proof finish without extra weight, you can use a “two pack” auto finish called DG (Direct Gloss) however you can only get this in base colours. If it has a pearl or metallic and you want two pack then you will need a clear over the base.

  15. go to your automotive store and purchase pin strip tape, no cutting needed, comes in different widths and it bends easily around turns and corners for masking your stripes, no paint bleed threw

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