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Pre Primed Crown Molding2/18/19
Installed a wall unit the other day where the general contractor installed crown molding around room and didn't tell us till we got there. The molding is from Home Depot and its pre primed. We sprayed cabinets with MLC CV. My question if I spray light coats of MLC Clawlock over their primer and than the CV will I encounter problems? Anybody had to deal with this?
Scott I do some finishing of pre primed mantels for a local firm. They are primed with a water based primer and I sand and prime again with Clawlock and topcoat with
Total crap shoot.
Some of those primers are total garbage. Some of them handle CV OK.
I've used a thin coat of vinyl sealer as a binder coat, recommended to me by our paint specialist at Sherwin Williams, and it seems to be the edge we need to make it predictably work.
Sand it off to bare wood. You will sleep better. I would't trust another product under a catalyzed product. At the end of the day you will have to sand it substantially to get an acceptable smooth finish.
I did try to spray CV on it and not a good result
Can you bring a piece back to the shop and do a test on it ? Those pre-primed primers are a toss up.An issue can show up weeks down the road, or show up right away, or not show up at all.
I've always heard vinyl sealer/primer is one of the most universally compatible products out there. I've used it over the primed products like use describe as well as stuff previously painted with oil/latex paints and many unknown finished and have been topcoating with CV for more than a decade and can't think of one issue ever related to it.
...and I'll add to that the biggest problem, usually, in those situation is the quality of the surface finish you start with. It's usually far from smooth enough to finish over as is so it does take a good bit of sanding to get it there. If whatever it is doesn't play nice when sanding (clogging, bad feathering) I'll shoot a heavy coat of shellac primer since it seems just as compatible with everything as the vinyl and can go on thick to cover and fill imperfections and dries quick and sands very easily.
Don’t do it, you will be very unhappy. The Claw Lock is way too “hot” a system and will do all kinds of crazy stuff overtop of a soft finish like a home depot type primer. Sand it off and then be sure to use a vinyl primer just in case to avoid any problems. I thing vinyl primer could be sprayed overtop of just about anything.
Best of luck
D. John Bishop