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Message: <blockquote data-quote="SVOMike86" data-source="post: 206165" data-attributes="member: 2070">Shawnfish- In answer to your question about sealing, you should either use a spar urethane, or a fiberglass resin to seal your decking.  Thompson's is not sufficient for the long run, but if you are serious about switching to aluminum in a couple months you should be ok.  If you still need to buy the sealer, I would suggest getting Helmsman Spar Urethane (about $30-35) a gallon. I'm not sure how much the Thompson's costs, but if your plans change and you decide to stay with wood decking for a season or 2, you'll be good to go.  I put 4 heavy coats on just my front deck (which is 6ft long) and still have 1/2 a gallon left, so 1 gallon should be enough for an entire boat.</blockquote>