Hair spray and jets? - RCCanada - Canada Radio Controlled Hobby Forum
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Old 06-10-2004, 02:12 AM   #1
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Hair spray and jets?

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I was thinking of using PolyU instead of epoxy to sheet my DV8R wings. Normally I use Pacer laminating epoxy. Get it on fast and pile tons of weight on the cores. I've never understood people thinning the epoxy as it seems to just absorb into the skin. This brings me to the hair spray. After reading a few posts about using PolyU, some modellers are using cheap hair spray to seal the balsa skins first. I guess the more glue that initially stays on the surface the better, but it sounds a little hair brained to me lol! What do you guys think?

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Old 06-10-2004, 06:37 AM   #2
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I thik hair spray is like a thinned out lacquer - right? That would basically seal the surface to some extent so the skins dont soak up a lot of resin and you dont need to use as much = lighter.

Personally, I use unthinnned west systems epoxy and it works fine. PU adhesive would also work great if you can apply it uniformly thin, and you definitely dont need a lot. Pray a mist of water on the cores and assemble. I have used about a litre of the stuff in the past year fooling with many types of joints and the PU glue is slowly replacing many places where I would use epoxy in the past.

I would try skinnning with PU no problem if it were me. But I wouldnt use anything to seal the skins.
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Old 06-10-2004, 08:22 AM   #3
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I haven't used it yet but I am going to try it. I put my epoxy on with an old credit card with a bunch of little notchs cut in it. They are about a 1/32 deep. I think pu would work the same only better since it really expands on setting up and get into the foam. Maybe you don't need the notchs and just scrape off most of it. Try it on some scrap before doing the wing and keep us informed what works the best.
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Old 06-10-2004, 08:28 AM   #4
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I have used P.U. to sheet a few wings and it works great. You do not need a lot of glue as it expands and will fill any areas that may have a small gap. Make sure you have good weight or vaccum bag and that the set up is secure and will not shift as it cures.
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Old 06-10-2004, 10:21 AM   #5
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I think using hair spray is not a good idea cuz there is other stuff in there besides lacquer...I guess if you want to eliminate split ends and tangles and have fuller, livelier, bouncy...uh...balsa, then hair spray might be the way to go , but personally, I don't want anything standing in the way of a good glue bond between surfaces...there are many other ways to save weight - what are we talking...maybe a couple of ounces on a 16- 20 lb jet????

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Old 06-17-2004, 01:48 PM   #6
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Man, just use ProBond....No messy mix, and it penetrate a lot more in the skin than any epoxy 'cause it's foaming. It's like when i use (discover) aeropoxy (Hysol) for the first time, Now i cant live without it
Sorry for my bad english
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