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Joe Turner
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Thanks for the info, Darryl. Wasn't sure whether I was getting concerned about nothing or not. Your response leads me to another question, though. I've always heard that wood surfaces being prepared for glue-up are better left unsanded. Is your recommendation for sanding the surface applicable generally, or only in situations where a dense wood is involved, or something else entirely? Thanks again,Joe Turner: Dear Joe,: Whether you use a PVA glue, straight urea resin glue or a combination will not really matter all that much for your work bench. The rigidity or shock factor of urea resin glue does not apply in your application and it will penetrate just fine on maple as long as you have a sanded glue surface. For optimal penetration you could mix about 20% PVA into the mixed Unibond 800. Any yellow glue will work fine. (For those reading this post that use Unibond 800 for veneering I do not recommend this technique as you want a hard, rigid glue line and adding PVA glue compromises this quality): In my opinion a butcher block table top is not what I consider a high preformance situation that really requires this level of consideration. If you were glueing up wooden propellers for airplanes then I think getting this technical would be prudent.: Sincerely: Darryl Keil: : Hi. I'll be gluing up a workbench top made of 2-inch wide strips of : : face-laminated hard maple. In a post at a different website, Andy Rae : : mentioned that he thought Unibond 800 was a good glue for this type : : of application. In "The Glue Book" (by William Young) though, I read : : that urea resin glue has limited shock resistance. The author : : suggests that the glue benefits by being modified by PVA glue, both : : for shock resistance and ability to penetrate dense woods like maple. : : He also states that not all PVA's are compatible with urea glues. My : : question is whether any PVA glues are compatible with Unibond 800, : : and whether you feel it's necessary or desirable to mix them for this : : type of application? Thanks for your time.: : Joe Turner
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