I guess I was wrong. Just read the data sheet on the bulldog, and looks like it can be mixed with the paint to use as a flex agent. At any rate, shouldn't be needed. If the stuff you used is a urethane, it is plenty flexable as it as, and you don't add flex agent to basecoat. The data sheet also says its not compatable with enamels, so if you used an enamel based paint, so could possibly be a problem if the products you used were enamel.