Originally Posted by PW01
I'm looking at Zinsser BIN which is shellac based and Zinsser Cover Stain which is oil based. Reccomdation?
Bin is an alcohol based shellac, great for spot priming water stains, knots, etc. They advertise it as a problem solver primer and claim it can be used to prime entire rooms. I don't recommend it, it dries too fast, and very hard, and can become brittle, causing a new set of problems. Cover stain is a better choice, but it too dries fast. I suggested an old fashioned slow drying oil base primer for a reason. The reason is it will penetrate deeper into the ceiling paint you have on the ceiling now, which is most likely a high clay content flat paint, not good in high moisture areas like your bathroom.
As far as the 123 primer, Aqua-Lock, or similar primers which have a sheen, they're OK, but you're still having problems. Those primers are latex and breathe a little, allowing moisture through. A good slow drying oil base primer does almost no"breathing" you want that to keep the moisture out. Check out Benjamin Moore Fresh Start 024 Alkyd Primer. If you don't have a BM dealer in your area, look into a Sherwin Williams equivalent product.
Having said all of that, if moisture has damaged the back of the drywall, or there is mildew there you are most likely still going to have problems at some point in time.
Regarding the K&B paint, some offer it in Satin or Semi Gloss, both will be fine. I prefer Satin, it has less of a shine.
HTH
I'm looking at Zinsser BIN which is shellac based and Zinsser Cover Stain which is oil based. Reccomdation?
Bin is an alcohol based shellac, great for spot priming water stains, knots, etc. They advertise it as a problem solver primer and claim it can be used to prime entire rooms. I don't recommend it, it dries too fast, and very hard, and can become brittle, causing a new set of problems. Cover stain is a better choice, but it too dries fast. I suggested an old fashioned slow drying oil base primer for a reason. The reason is it will penetrate deeper into the ceiling paint you have on the ceiling now, which is most likely a high clay content flat paint, not good in high moisture areas like your bathroom.
As far as the 123 primer, Aqua-Lock, or similar primers which have a sheen, they're OK, but you're still having problems. Those primers are latex and breathe a little, allowing moisture through. A good slow drying oil base primer does almost no"breathing" you want that to keep the moisture out. Check out Benjamin Moore Fresh Start 024 Alkyd Primer. If you don't have a BM dealer in your area, look into a Sherwin Williams equivalent product.
Having said all of that, if moisture has damaged the back of the drywall, or there is mildew there you are most likely still going to have problems at some point in time.
Regarding the K&B paint, some offer it in Satin or Semi Gloss, both will be fine. I prefer Satin, it has less of a shine.
HTH