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Finish for old pt plywood

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  • Finish for old pt plywood

    the floor of my aluminum boat has a sheet of pressure treated plywood attached that is about three years old. I was thinking about giving it a few coats of spar finish.
    is this a good idea,is there a better finish or should I just leave it alone?
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  • #2

    Re: Finish for old pt plywood

    It should be fine, the pressure treat would have leached out by now.

    Spar varnish might be slippery, depends on how smooth the floor is.

    Nathan

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    • #3

      Re: Finish for old pt plywood

      Originally posted by nnieman View Post
      It should be fine, the pressure treat would have leached out by now.

      Spar varnish might be slippery, depends on how smooth the floor is.

      Nathan
      thanks,may throw some grit in the last coat

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      • #4

        Re: Finish for old pt plywood

        Originally posted by al.m.. View Post
        thanks,may throw some grit in the last coat
        It can’t hurt!

        nathan

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        • #5

          Re: Finish for old pt plywood

          Actually.....its a bad idea.
          Leave it or just stain with a penetrating stain (NOT a film forming surface stain.....or varnish, that can ...and will...delaminate).

          Two things will happen if you proceed with your Spar varnish plan.

          First of all...water gets under the ply (its a boat, right) and will then rise up through the ply from the underside and the resultant hyrdostatic vapor pressure will start to pop off your varnish. (It always does, just like any coating on wood that is close to the ground or to damp soil or a water source...this is a natural law of the universe.)
          Secondly you will discover that Spar varnish is not all its cracked up to be and it will itself fade, degrade and start to delaminate (simply because it can and there is lots of UV around) ...despite what the manufacturer's say.....and BTW I have used lots) and you will find yourself sanding and repainting the wretched ply every 2nd or 3rd year....which is fine if you like that sort of thing but I find the thrill wears off fairly quickly.

          Good luck to you!
          Last edited by Julian; 04-19-2019, 06:42 AM.
          Merv in Regina likes this.

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          • #6

            Re: Finish for old pt plywood

            Looks like I have some research to do

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            • #7

              Re: Finish for old pt plywood

              I've heard of being able to buy pressure treating chemicals you can soak in to wood somehow not sure, never seen this happening, but I heard through the vine sort of thing if you buy treated wood it's light on the chemicals and you can add more after.....

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