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gulleyj 08-18-2013 03:02 PM

acrylic over oil problems
 
The funny thing is that I am still surprised to be surprised by the dumb things I can do…

The situation: a kitchen wall with a window over a counter with a sink and cooktop. Less than 50 sf of surface. The wall was painted with an off-white, satin finish, oil-based paint ten years ago and the paint film was in perfect condition. The client (my elderly Ma) wanted the wall to be a cheerful leaf green color and because she has respiratory issues, needs to use the kitchen asap and could not vacate, I decided to repaint with an acrylic (a semi-gloss enamel made by Benjamin Moore) using lots of exhaust ventilation.)

I washed the wall with a 50/50 water/ammonia solution and sanded it with 150 grit on a drywall pole sander. Then I washed it again with a product called Liquid Sandpaper and let it dry/evaporate for an hour. Pretty thorough, thinks me, but then comes the brain cramp.

Instead of a primer I go straight at it with an acrylic eggshell. What was I thinking? Well, the wall will need at least two coats to go from white to middling green, so the first coat doesn’t need to have the final, semi-gloss, so let me just use this paint I already have that matches the final color almost exactly. Now of course this first treatment scratches off with a fingernail after 100 hours of curing. What to do?

Do I need to sand/scrape off all the green paint? Or will a coat of BIN Primer “sandwich” this layer firmly to the wall?

Jmayspaint 08-18-2013 03:28 PM

Quote:

Originally Posted by gulleyj

Do I need to sand/scrape off all the green paint? Or will a coat of BIN Primer “sandwich” this layer firmly to the wall?













Once there is a non bonded coat on a surface nothing will 'fix' it except removal of that coat.

Oil priming and top coating again may improve the problem some, but the film will still scratch off.

ToolSeeker 08-18-2013 04:05 PM

I really think the Liquid Sandpaper is causing your problem. NASTY STUFF!

chrisn 08-18-2013 05:44 PM

100 hours? of course it is going to scratch of, so just don't do it till it fully cures, 3 weeks at least and you should be fine

cdaniels 08-18-2013 07:11 PM

With the prep you did you should be fine once it has completely cured.Would a bonding primer have been a better first coat?Of course but the sanding should take care of bonding issues once it is cured.


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