How to fix a crack of foam wing ? - RC Groups
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Jun 02, 2001, 01:25 AM
Spritual Pilot

How to fix a crack of foam wing ?

My simple 400 have a crack in the wing.
What is the best way to fix (or glue) this
crack ? Is there any glue that has a good
penetration, but doesn't melt the foam ?


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Jun 02, 2001, 01:34 AM
Registered User
Epoxy works pretty well with this type of foam if you think you can "smoosh" it into the crack.
I think there are some foam-safe CA adhesives, but I have not used them on this type of foam.

Jun 02, 2001, 02:08 AM
Caution:Makes sharp left turns
Troy's Avatar
If it's just cracked and not completely severed I think thick foam-safe CA would work OR Pro-Bond polyurethane glue because it expands while curing and will seep into the pores of the foam well. It is light and sands decent too.
Jun 02, 2001, 08:30 AM
Registered User
poobs's Avatar
Sorry about the damage - hang in there.

I use epoxy. Drip it in the crack, push it a bit with a tooth pick etc. You can smooth it out on the surface with a thin piece of scrap ply or cardboard like a spatula.

When it dries, try to heat the covering back over it or patch it up.

good luck!
Jun 02, 2001, 09:41 AM
jean-claude Terrettaz
bidule's Avatar
I will fix with epoxy and ligth cloth .5 oz , 1 inch wide .Good luck. J-C
Jun 04, 2001, 08:44 PM
Spritual Pilot

Thanks everyone. The CA attracted me. However, I fixed with Epoxy mainly because I have it. I also enforced the leading edge with balsa wood. It looked too weak to me.