Ok so some people are saying do not use silicone to coat the camper roof and around the vents. I was looking at the Henry products because someone told me it works great, but the product that the Henry people suggested was the 887 which is 100% silicone, another roofing product they have is 100% acrylic, can someone help me to get the right product to re-coat the roof and seal around the vents, with hopefully the same stuff Thanks Barry