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Boston Whaler never "put a thin coat of varnish on the mahogany" wood. Three coats of a polyurethane product, identified in the Fisher-Pierce Company wood diagrams as "Bostick #435," was sprayed onto the mahogany with sanding of the wood after the first two coats. Three coats of polyurethane applied to the wood was sufficient to cover the raised grain.

It is important for anyone owning a boat with a RPS seatback to keep the drain holes in the base free of debris, so water cannot pool, causing rot. I always drilled additional holes in the base wood to alllow for increased water drainage from the seatback.