Paint it is.Me: Some primers absorb water and must be top coated. Is that true for your primer sealer, or can I use it as a topcoat? I painted a car floor with it and want to put the rug right on top, without topcoating, unless the primer will absorb water. Duplicolor: The Primer Sealer will prevent it from absorbing water, so you can top coat it. It is not designed to be used as a stand alone product. Me: Is that because of UV or moisture or something else? The particular application is a car floor, so it wouldn’t be exposed to UV.Duplicolor: It is designed to be top coated. It will not hold up well as a top coat.