Oil base paint – How do I know?
The rule in painting has always been, if it was painted with an oil base/alkyd paint, you need to recoat with an oil base/alkyd paint. With the new Canadian VOC regulations regarding paints and primers, the old rules will have to change. Soon oil base/alkyd paints will no longer be available.
The problem then is two-fold: 1/ how do you know if the surface was painted with oil base / alkyd paint and now, 2/ how do you recoat it?
Generally speaking, if you can get a chip of paint from your surface then old oil base / alkyd paint will be brittle. Also, as the paint breaks down in the sun, oil base / alkyd paints tend to chalk more than latex or acrylic paints.
Nail polish remover with acetone or methyl hydrate will dissolve latex and acrylic paint. If you wipe the painted surface with a clean rag dipped in the chemical and the paint comes off on the rag (more than just the surface chalk) then you have acrylic / latex paint. If not, you have oil base / alkyd paint.
Knowing this difference is important; now you can determine which products to use to recoat.