Covering Balsa Wood Model Airplanes: Film, Tissue and Fabric Step by Step
Covering a balsa model is done in the same order whatever the material: sand the frame smooth, cut the covering a little oversize, tack it down at the edges, then shrink it tight. Iron-on films (Oracover/UltraCote/MonoKote types) are the easiest and need no paint; tissue with dope suits light rubber and small vintage models; heat-shrink fabric is tougher and suits scale models. Most problems, like wrinkles, bubbles and loose edges, come from rushing the preparation or using the wrong iron temperature.
By Kyle HilsonUpdated: October 20264 min read
Prepare the frame
- Sand all joints and edges flush with a sanding block; covering shows every bump.
- Round leading edges and wingtips to the plan’s shape.
- Remove all dust with a tack cloth or vacuum.
- Fill dents with lightweight filler and sand again.
- Check the wing for twists before covering; covering locks them in.
Which material
| Material | Best for | Tools |
|---|---|---|
| Iron-on film | Most RC sport models | Covering iron, heat gun |
| Lightweight film | Gliders, light park flyers | Iron at lower temperature |
| Heat-shrink fabric | Scale, vintage, large models | Iron, heat gun, possibly paint |
| Tissue + dope | Rubber and free-flight, small vintage | Brushes, dope, water spray |
Materials are compared in more depth in model aircraft covering materials.
Covering with film
- Cut the film about 2–3 cm larger than the part all round.
- Peel the backing and lay the film adhesive side down.
- Tack it at the centre of the root and tip, then along the edges, pulling lightly to remove wrinkles.
- Seal the edges all round with the iron at the maker’s sealing temperature.
- Shrink the open bays with a heat gun or iron at the higher shrink temperature, working from the centre outwards.
- Trim the excess with a sharp blade, leaving overlaps of 3–5 mm.
- Overlap the top and bottom pieces at the leading edge, with the top piece over the bottom.
Covering with tissue
Brush thinned dope or glue stick on the frame edges, lay the tissue with the grain spanwise, and press it down. Trim the edges. Lightly mist with water to shrink it, let it dry pinned flat to avoid warps, then apply two or three thin coats of thinned dope. Each coat tightens and seals it. Use a ventilated room for dope or a water-based alternative.
Temperatures and tips
- Each film has its own temperature: check the maker’s sheet and test on scrap.
- Use a sock on the iron to avoid scratches.
- Too hot causes sagging or melted spots; too cold leaves loose edges.
- Prick small bubbles with a pin and iron them down.
- For compound curves, heat the film and stretch it gradually, a little at a time.
Trim and colours
Add trim stripes and colour panels after the base covering, using the same film on top at a lower temperature. Plan a high-contrast scheme: a dark underside and bright top help with orientation in the air. Avoid too many overlapping layers, which add weight. More technique is in RC airplane covering.
Fixing mistakes and repairs
- Wrinkles: reheat and shrink; if stuck, peel back and re-lay.
- Loose edges: re-seal with the iron.
- Holes: patch with a piece of matching film, rounded corners.
- Sagging on hot days: reshrink at home; park the plane in the shade.
- Re-covering: peel old film carefully with heat; sand and clean before the new covering.
FAQ
What is the easiest covering for balsa?
Iron-on polyester film.
Do I need a heat gun?
It helps on curves and large panels; an iron can do most work.
Can I paint balsa instead of covering?
On sheeted parts with glass cloth or sealing; open frames must be covered.
How do I avoid wrinkles?
Tack at the corners first, seal edges, then shrink from the centre outwards.
More on this topic: the complete RC Airplanes guide covers the basics behind this article.
About 20 years in RC. Mostly boats in the NAVIGA Mini Eco Expert class, with many self-made parts; also a King Motor Baja 5B, a home-built electric plane, home-built nitro planes he has flown, and an RC helicopter. More about SwellRC
