Quote:
Originally Posted by CampNBrew2
This was in response to the poster who mentioned possibly using a spray undercoating applied over the Darco. Since I agree with you that the Darco is only truly attached at the edges, I would recommend fastening it more thoroughly if someone wanted to undercoat it. I would argue that the staples do in fact make it "stick better". The other tape would be to seal those staple puncture holes if someone felt the undercoating wouldn't provide that.
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Stapling a thin plastic sheet to 1/8" luan plywood, then covering it with waterproof tape (to make it more waterproof) before spraying the surface with a waterproof "tar film" is a "feel good exercise" that doesn't make anything adhere better or resist water better. The point is that you can apply any flexible coating on the DARCO liner and the entire structure will still only be as strong as the weakest link. The staples will likely pull out of the 1/8" luan plywood in the first few miles of vibration during the first tow.
If someone wants to believe that a 5 or 6 mil sheet is a suitable base layer upon which to build a waterproof covering, well, OK, go ahead and do it. IMHO, it's an exercise in spending money chasing unicorns and rainbows. Until there's a solid base upon which to build, all you've got is a 1/8" luan panel and a sheet of "too thin plastic" as a foundation. Again, IMHO, it ain't gonna work out well.