: I've used Flagship on a kayak for a customer a few years ago. It has a rather
: dark hue but is really nice stuff. To answer this part of the question, go
: to the Pettit (Z-Spar) website and download the application PDF.
: http://www.pettitpaint.com/fileshare/product_pds/28720106.pdf
: On the first page is a paragraph of general surface prep. "
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I've used Pettit's products for many years and use either their brushing or spraying thinner as a wipe for their as well as other brand varnishes and have never had a problem. Their brushing thinner is nice to have as it can also safely be used to thin the varnish, the spraying thinner dries faster, but for your use a little extra time probably won't matter.

Bill H.