Osi quad max, 9.5 oz, #827 blue, siding & window sealant, use interior or exterior, seals around windows, doors & siding, bonds to fiber cement, cedar, brick, stone, coated aluminum, fiberglass, vinyl, pvc, stucco, eifs, wood, glass, flashing tapes & kynar coatings, no need for a primer, perfect color match for leading siding & window manufacturers.