That is some pretty accurate sanding with a full size grinder on those scupper drains. I have always used a flap wheel on the grinder and sanded with the DA. I may have to try a sanding pad on the grinder.
Every time I have used poly or vinyl on large wet outs I have trouble with my working times and pot life so I have been sticking with epoxy on everything. I love epoxy but man does it get expensive. How do you approach large wet outs? Are you using waxed or un-waxed vinyl?
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