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shrink wrap for composite clamps?

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deermaster:
i saw in a PA mag (april/may) in a r/d glue up article that he was using saran wrap or a shrink wrap to clamp the backing to the core.  i baught a roll at home depot and was wondering if it is strong enough to get a good glue joint or if a rubber stretch wrap like inner tubes should be used on top of it? thanks for any info!

Justin Snyder:
I use saran wrap, but it is to keep the mess down. I still use clamps.  Justin

bowstick:
My dad was the one who posted that article.  It is true... You can use 120 guage or thicker stretch film for just clamps.  YOu must go over the same spot 3 or 4 times and start from the handle and stretch as hard as you can without breaking the wrap... This method only works with wood to wood, it does not work with fiberglass composite bows. 

Justin

tom sawyer:
My guess is, if you wrap it tight then it would work.  You don't need a tight clamping with URAC or resorcinol, in fact you can starve a glue joint if you do.  You do want good contact between the surfaces though, to minimize large gaps.  URAC fills gaps up to 1/16" I think.  You might need clamps if you are forcing the glueup into a particular shape such as a R/D.

I assume you are using a catalyzed glue and not something that needs to air dry.  I don't know if covering a bow glued with Titebond would work, and you do need more clapming pressure for those types of glue I think.

Justin Snyder:
The biggest problem I forsee with the whole concept is,  you have to hold the pieces perfect while wrapping.  While wrapping the two pieces will slide back and forth.  This will work the glue out of the sides of the joint and potentially starve the joint.  Another problem is that with wood and a water based glue, the thin wood tends to roll up on the edges when it absorbs the water.  This meathod would allow no practical means of fixing that.  Lets just say the cons far outweigh the pros.  Justin

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