[NSRCA-discussion] Epoxy Question

[rcmaster199 at aol.com]

Jim,


?


The PolyU is applied practically the same as epoxy, meaning similar amount is used. A 500 square inch wing will use about 20-25 grams for both surfaces....I use a?piece of plastic such as?hotel key as squeege, then a roller to smoothen and?assure even coating.?The residual on the roller is applied on the foam to activate the surface. Sounds more complex than it is. BTW, I asked?a hotel clerk?to give me?some blank keys. Now I have enough to last the rest of my life


?


It's a matter of preference which to use. I have found neither adhesive to have enough advantage over the other to change the technique. I use PolyU to set the sleeves in the core and to apply the vertical spars to the sleeves. Then epoxy for skinning. The vertical subspars form an "I" beam, tying the sleeve to the skins. If you go to terry Brox's website, I explain it there.


?


I started vacuum bagging several years ago and that is a technique worth learning. I wouldn't build another wing or stab without it


?


MattK










-----Original Message-----

From: J N Hiller 

To: NSRCA Mailing List 

Sent: Wed, Nov 21 4:29 PM

Subject: Re: [NSRCA-discussion] Epoxy Question





I have been reluctant to try it thinking I would screw it up. How much do  you put on? How much weight is needed to contain the expansion.  Jim Hiller     -----Original Message-----  From:   nsrca-discussion-bounces at lists.nsrca.org  [mailto:nsrca-discussion-bounces at lists.nsrca.org]  On Behalf Of wgalligan  Sent:   Wednesday, November 21, 2007 1:14 PM  To: NSRCA Mailing List  Subject:    Re: [NSRCA-discussion] Epoxy Question    If this question was raised as a method for skinning wings, then why not use  urethane glue. One part, spreads easy and cures hard and quickly with plain  ole 02moisture.  Gives ample working time and unlike epoxy will expand with  moisture to fill voids and between foam beads.  Available at local hardware  stores and less expensive.    Seems like a no-brainer to me.    Wayne Galligan    ----- Original Message -----  From: "J N Hiller" jnhiller at earthlink.net>  To: "NSRCA Mailing List" nsrca-discussion at lists.nsrca.org>  Sent: Wednesday, November 21, 2007 2:00 PM  Subject: [NSRCA-discussion] Epoxy Question      > Thin Epoxy? I have been using "HOBBYPOXY SMOOTH 'N' EASY" epoxy finishing  > resin to skin foam wings, spreading it with a scrap balsa squeegee. It has  > ample working time and is thinner than glue. Is this OK? I have had no  > problems using it on unsealed skins at about one ounce per 800 square  > inches. I need to try sealing the skins on my next build.  > Jim Hiller  >  >  >      ----------------------------------------------------------------------------  ----      > _______________________________________________  > NSRCA-discussion mailing list  > NSRCA-discussion at lists.nsrca.org  > http://lists.nsrca.org/mailman/listinfo/nsrca-discussion  >  >    _______________________________________________  NSRCA-discussion mailing list  NSRCA-discussion at lists.nsrca.org  http://lists.nsrca.org/mailman/listinfo/nsrca-discussion    _______________________________________________  NSRCA-discussion mailing list  NSRCA-discussion at lists.nsrca.org  http://lists.nsrca.org/mailman/listinfo/nsrca
-discussion  


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