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Western Red Cedar Solvent Soluble Extractives10/26
I’m having problems with finish blistering on Western Red Cedar as a result of what appears to be solvent soluble extractives which are volatizing due to heat in combination with solvent based primers and seem to be drawing some type of extractive to the surface of wood. It is happening on 10-20% of all t&g material I’m finishing. The blisters aren’t moisture or solvent blisters.
In conversation with TiteBond glue Techs, they told me W R Cedar is showing up with high extractives, enough to repel water based glue. We had been having trouble with Cedar panels coming apart, prompting my call.
I suspect your problems are related to mine.
He said 20% of the WRC coming in to the US will have the high oils.
He recommended wiping it down with Acetone until no more extractive showed up on the paper towels.
Thanks for the reply.
After exhaustive research I’ve come up with this:
Tropolones are highly volatile oils found in WRC heartwood. They are heat activated and organic solvent soluble. According to Canada’s Western Forest Products Laboratory, Tropolones
Yes, I wil bet they are the same cause and effect problems. I think it is huge, but just has not yet caught on and made it to all the small shops. The big shops have to know, but do not act like it at the moment. I know what I will do, but it will be interesting watching what the big Cedar users do.
I'm aware this is an old post. I don't come by this forum very often so hadn't seen it in the past.
I used to have glue failures with WRC but after some testing found that urethane glues work well. While overall I'm not a fan of these adhesives I do keep them around for WRC and other unusual gluing jobs like wood to metal, glass etc. My go to brand is Franklin as it seems to be a little more solid (less foamy) than some of the others.