Re: Bolster backing material - \" whaler board \"
Not sure what you found but if it was seemingly heavy, it was more likely a HDPE based product. Trex, Everwood and a number of other plastic decking suppliers have similar products but are HDPE (high density polyethylene) - think cutting boards and starboard - a totally different plastic chemistry.
Like the Azek product, Komatex is another lightweight pvc foam that would work well for bolster or combing backing.
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