Since PL Premium does not have UV protection, it must be covered by paint. As Dave states, the PL Premium "never cracks, peels or abrades off". In private conversation with him, he also told me it does NOT bleed-through the cloth and therefore not affect the inside color of the cloth (which paint on the outside of the skin will affect).
I intend to use it on a Wee Lassie that I'm building. I'll let you know the results.