Oil Or Water Based Kilz Primer ?
Hello, I have a water stain (brownish) on my bathroom ceiling. Problem has been corrected, and I don't expect a repeat. Would like to put Kilz Primer/Sealer over the stain. Since I don't expect any further leakage, can I use a water based Kilz instead of their oil based product ? Or, would the brownish stain would eventually bleed thru any water based Kilz, even though the stain is dry now ? The reason I ask, is that the ceiling is presently painted with a latex paint, and if I have to put the Kilz over the whole ceiling to make things blend well for the future topcoat of a regular paint, I know an oil based product like Kilz oil would probably not go over the presently latex painted ceiling well. Thanks, B. Latex primer/sealers do a poor job of sealing stains. Use the oil base original kilz or a pigmented shellac like zinnser's BIN. Both can be used over the latex paint. You shouldn't need to prime the entire ceiling unless the majority of it is covered by the stain Since the ceiling was recently painted, it should touch up well. Latex paint over the kilz will take longer to dry than it will over the latex but it should blend in within 24 hrs. The oil-base Kilz is the way to go here. One random side note: for situations in which water-base primer is called for, water-base Kilz is evil stuff. From reports here, I don't think it would be too much of a stretch to call it pathetic ooze not worth the can it is packaged in. SirWired It may depend on the lighting in the bathroom, but I think if you spot prime only - the spot (when painted over) will be glossier and / or a slightly different color (whiter - particularly if the finish paint is not very high hiding), than the rest of the ceiling. Stain blockers form very tight films which will hold out the subsequent coat of paint increasing the sheen. They are used as enamel undercoaters for this reason. Also, if the bathroom is not vented or not vented very well, I would use an oil (alkyd) stain blocker such as Kilz or Cover Stain instead of shellac. I would not use a water-based stain blocker for a water stain (as already noted) they are not very good stain blockers for water soluble stains. I always use Sherwin Williams Pro Block for my water stains. At least 9 out of 10 times it is successful. If not, I break out the Pro Block Oil. This gets it every time. If the stain is really dry, the latex usually works. I do this method because I do not like painting a ceiling with a spot oil primer with latex around it. Possible flashing. If I do use oil primer, I cover the oil primer with latex primer before the finish coat. Originally Posted by Robert111 Would like to put Kilz Primer/Sealer over the stain. Since I don't expect any further leakage, can I use a water based Kilz instead of their oil based product ? Or, would the brownish stain would eventually bleed thru any water based Kilz, even though the stain is dry now ? Most water stains will bleed through most latex primers It has nothing to do with further water damage, it's a stain thing Kilz latex products make poor stain blockers Kilz latex products make even worse primers They have poor adhesion and a high failure rate as primers Originally Posted by Robert111 The reason I ask, is that the ceiling is presently painted with a latex paint, and if I have to put the Kilz over the whole ceiling to make things blend well for the future topcoat of a regular paint, I know an oil based product like Kilz oil would probably not go over the presently latex painted ceiling well. You can spot prime the stain, then spot paint the area(s) to insure no flashing when painting your final all over coat
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