Oil based paint over latex kilz. Barb is right not all kilz primer is oil based. Oil based kilz primer can be painted over with any type of paint after 1 hour with good drying conditions 65 75 degree temperatures and good air circulation. If not the existing paint is oil based. This may sound even more confusing so to help you understand better here is a thorough.
I prefer zinsser but when i have used kilz i have bought the latex version because i absolutely hate the messy cleanup of oil based products. As a rule is one not supposed to do oil based primer over existing latex paint. But you can put latex paint over oil based as long as you prepare the surface properly firststart by finding out if the existing paint is oil or latex by rubbing the surface with denatured alcohol on a rag. If some of the paint comes off on the rag its latex.
The truthful answer to this question is that you shouldnt paint an oil based product directly over latex paint but it can be done if a sealing coat is used to separate the layers. However at the same time it is also said that it is perfectly okay to use latex paint over an oil based primer. Additionally since oil based paints tend to have a glossy sheen it follows that the biggest issue to deal with will be glossiness not the paints base content. Lightly sand the surface with fine sandpaper 180 to 220 grit to remove the gloss.
To apply latex paint over oil based. It is a commonly held belief that oil based paints dont mix well with other types of paints. If your kilz is indeed oil based you have a choice of using either oil or latex paint. Kilz original am i remembering correctly.
Start by finding out if the existing paint is oil or latex by rubbing the surface with denatured alcohol on a rag. Kilz 2 all purpose primer previously kilz 2 latex is a fast drying water based multi surface primer sealer stainblocker with excellent adhesion mildew resistance sealing properties and very mild odor. New name same trusted formula. Interestingly though on the other hand you cant use oil based paints over latex paint.
Very porous surfaces can absorb more primer and will need a little more time. This is for a bathroom re paint. Because latex paint has built in flexibility it doesnt make the ideal base for oil paint which has a hard finish. Howeverlatex paint is ok over oil based primer.
Painting over oil based paintslatex paints will not stick to oil based paintsthe exception is that an oil based primer may accept any kind of top coat paintfor that reason an oil based primer is recommended to be applied over any oil based top coat then a water based paint may be used as a top coat.