Hair Spray has been a long standing substance but I'm trying to understand why the heck anyone would use Petroleum Jelly? Then again, I'm trying to understand why no on else has questioned said ignorance before me? But again, I'm dumbfounded as to why such a need exists, I've had Invisible Decks that I've used steadily for years and NEVER had to re-treat them. . . I'd typically replace the deck long before such a need would arise. Given the headache of re-treating them or worse, making your own deck, I simply can't see why roughing or smoothing is an issue in today's world.