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boman47k 08-29-2006 08:50 PM

water over oil
Anyone ever have white water based paint ( BM) turn when applied over oil primer/sealer? This is on the chair rail. I have seen clear finish turn dark when put over oil or visa vesa, but not sure about paint. Actually what we are seeing may a reflection from the darker walls. The crown looks white, but the ceiling is also white. What is throwing me off is that the next room also has the same theme, but the rail looks whiter. BUt something is strange with the newly painted room.

boman47k 08-29-2006 08:53 PM

I meant to add that the crown was primed with BM All Purpose primer. The rail was primed with some kind of oil based primer that my buddy had.

slickshift 08-30-2006 08:23 PM

Was the chair rail raw wood, or was it previously stained?

boman47k 09-05-2006 06:49 AM

Sorry for the delay, had trouble with pw. The rail was previously painted white. I'm thinking the difference is my buddy used oil primer on the rail while I used BM All Purpose on the crown.

slickshift 09-05-2006 04:09 PM

Hmmm...the BM All Purpose I use is oil-based

slickshift 09-05-2006 04:21 PM

But to answer your question

Originally Posted by boman47k (Post 17101)
Anyone ever have white water based paint ( BM) turn when applied over oil primer/sealer?

Not normally, no
But...if the primer/sealer is over a very dark or stained wood, and the primer sealer doesn't quite seal it, yes the white top coat can turn dark

The dark stain can take a few days to bleed through the primer/sealer so it can look OK the day after priming, then you paint it, then three days later the dark stain bleeds through

It doesn't sound like this is the case with your problem though

boman47k 09-05-2006 10:47 PM


Originally Posted by slickshift (Post 17494)
Hmmm...the BM All Purpose I use is oil-based

That would make better sense to me. I'm thinking it was acrylic which I am calling water based. I had never used any 'all purpose' water based primer. I have used oil based then top coat with water based with no problem many times. The primer wei used was in a gallon bucket. The primer I used on the cabinet doors was also 'all purpose'but in a quart sized can. This is where I read the acrylic part ( I think) and read the part about being suitable to go over oil and/or water. oh well, maybe it was just a reflection from the darker walls. It is possible the gallon can was different I guess. Actually, I had a feeling the rail was painted with oil and we primed with acrylic. and then painted with acrylic enamel thereby causing the change in color. It was not my call to make though. If it was my job, I would have tried to check and see if we were covering oil or water based paint.

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