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Per the instruction manual, I plan to use Interlux Perfection for the hull bottom, since the boat will be trailered.

In the preparation instructions for this paint there is a section called "Bare Fiberglass" which is what I had planned to follow. My thinking was it should be the same as fiberglass-encapsulated plywood as far as preparation is concerned. However, part of the prep includes one coat of Interprotect 2000E, which is a two-part epoxy product designed to prevent water permeation. This leads me to believe that the "Bare Fiberglass" section is for polyester resin fiberglass, not epoxy resin.

Since I am using epoxy resin (obviously), it seems to me that I should be following the "Clear Epoxy" section instead. That is, my understanding is that epoxy resin itself prevents water permeation. The Interlux "Clear Epoxy" prep section is basically the same as the "Bare Fiberglass" section except that it does not include the use of Interprotect 2000E. FYI, here is a link to the Interlux Perfection instructions: http://www.yachtpaint.com/MPYACMDatasheets/Perfection__+eng-usa+A4+Y+20100608.pdf

I know this seems like a "no brainer," but I want to be absolutely sure. I have no desire to be lifting the boat off the trailer someday and having to re-do a botched paint job.

Hi Dana,

I'm not familiar with Perfection but if it's any consolation you don't have to remove the boat from the trailer to repaint the bottom. You can use the tie down straps to strap the boat against one of the bunks then remove the other side for full access to that side. As for which instructions to follow, I'd go with the epoxy ones. My bottom is originally painted with automotive acrylic urethane but repaired with Interlux Briteside. No problems with paint yet. The biggest concern with water intrusion is going to be caused any damage that scratches into the fiberglass itself. Repair that asap. Polyester resins have issues with water getting between the gel coat and the cloth layer and causing "boat pox" . I'm helping a friend with an old 1970's runabout that suffered from that sometime in the past. The cure involves removing the gel coat layer and repainting. That's the most likely reason for the epoxy base coat on the Perfection.

Chris