While I agree with Marty L. and his approach to using 1/2" plywood and epoxy coating I think that there are other alternatives to metal backing plates.? One fellow I know of makes his own out of cloth and epoxy laid up in a mold.? The last backing plate I made came from some pretty cheap cutting board material that was close to 1/2" thick.? There is also a product called Starboard that is a near equivalent to the cutting board material that is pretty expensive as it is intended for marine use.?
Use a caulk like 4200 to seat it, whatever the material you use for your backing plate.
My $.02.
CalebD
#328 Odalisque, 1967
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