A recurring question on KRnet is how to glue urethane foam to urethane
foam without a difficult-to-sand "hard" line resulting between the foam
layers. I was reading the March 2019 KitPlanes and there's a pretty
impressive four page story on using urethane glue and "lightweight
spackling" in a mixture of 10:5 (by weight) for exactly that purpose.
He says it's 60% as strong as the foam. I think he was using much
stronger (in compression) foam than our foam, and given that we mainly
use the foam as a form to lay up fiberglass on as an air surface, I
would think it would work fine for our purposes. He says it sands just
like the foam.
He tested both Gorilla Glue and Elmer's urethane glue and
Sherwin-Williams Shrink-Free Spackling. You can vary the
mixuture....the more spackling, the easier it is to sand, and the more
glue, the stronger the joint is, if extra strength is really needed (but
now it's harder to sand again).
If you're not subscribing to KitPlanes magazine, you've been missing a
lot for the last few years. The new editor is a serious breath of fresh
air, and has lit the place on "technical fire"! It's easily twice or
three times as good as before. I read almost every page of every issue
of Kitplanes as I receive it. I have a huge pile of Sport Aviation mags
that I've never opened, by comparison. Somebody please know if there
are any good articles in there....
--
Mark Langford
m...@n56ml.com
http://www.n56ml.com
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