I sealed mine last month because I thought it was necessary. This is what I get for listening to others. I now have small tar spots that blow onto the front porch continually. On the walls, on the window, on the floor, on the brick, on the ceiling. IT must have been a defective product, but now I'm stuck with a mess. Homeowners hasn't helped, the manufacturer hasn't helped. This is only one opinion, but I say do NOT screw with a sealer!!!