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Help! Waterproofing?

#1
So I’m building a seaplane, and I’m using maker foam. As a test, I put a little wingtip float in the sink and there were immediate leaks. Within a minute, all the paper cane off. If there a way to combat this? I’ve seen minwax, valspar, and boot sealant. Anyone tip in and give your thoughts/ experiences!
 

The Hangar

Well-known member
#2
I've never used minwax on waterproof FB. Honestly most the time with a plane you're flying, so just being in the water a little bit when taking off and landing doesn't really matter for maker foam. Just an FYI the brown FTFB is a bit more water-proof than the maker foam.
 
#3
I've never used minwax on waterproof FB. Honestly most the time with a plane you're flying, so just being in the water a little bit when taking off and landing doesn't really matter for maker foam. Just an FYI the brown FTFB is a bit more water-proof than the maker foam.
My mess up trial hull shows that small dots of water get through, and eventually spread
 

Ketchup

4s mini mustang
#4
Are you sure that you are using maker foam? The flite test stuff should already be waterproof. If it isn’t water proof for some reason then minwax might work. I haven’t personally used it but there is an old FT video on it. Also, hot glue won’t stick to minwax, so it has to be applied to a finished plane. Good luck!
 

BATTLEAXE

Well-known member
#6
My mess up trial hull shows that small dots of water get through, and eventually spread
I have no experience with the Maker Foam myself but i know a good seal with HG at the seams and a coat of oil based poly, before paint as a primer coat, should seal things off. The FT vid shows also mixing polyurethane with baby powder to make a light slurry and apply that to build up almost a light shell of sorts. I think it was in conjunction with strips of brown wrapping paper like paper mache style. If that makes sense.

Here is the vid
 
#7
Are you sure that you are using maker foam? The flite test stuff should already be waterproof. If it isn’t water proof for some reason then minwax might work. I haven’t personally used it but there is an old FT video on it. Also, hot glue won’t stick to minwax, so it has to be applied to a finished plane. Good luck!
Yep it’s maker foam, with the box and everything. At this point, I think I’ll minwax then paint and valspar for an extra layer of paint protection and waterproofing