I dunno - what kinda durable are you looking for? Hold up to weather, or a
beating with a ball bat. Probably not much will stand up to the latter, but
about 10 years agon on a lark I slapped a brush full of Sears Weatherbeater
on the 18 inches of 3 inch PVC vent pipe (2 of them). The house is
undergoing it's 2nd paint job since then, but other than fading some, the
pipes are still hoding the paint.
Mark - Central Ohio USA area.
You can avoid sanding the pipe by lightly rubbing it down with a clear PVC
primer first. I said "lightly" because it actually softens the outside of
the pipe (this is the same solvent used prior to glueing the pipe so be very
sparing with it. It is also highly flammable.) After that, you can use
most any enamel paint. However, Krylon now has a paint that is used for
plastic patio furniture and reportedly has a bondable feature for use with
PVC. I would check into it.
Last year I painted my furnace intake/exhaust pipes. Sanded lightly
(with 220 I think, just enough to take off the gloss), primed it with
some gray spray primer I had on the shelf, then finished it with a
couple coats of gray enamel (again what I had on hand, Krylon maybe?) to
blend with the grayish siding. Its only year later but looks fine.
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