I have made arrangements with Sherwin Williams to purchase their paint. They also recomend their primer "Prep Rite Anchor Bond". But I have read alot of postings and it seems Like the products of Zinzzer might be better? Bulls Eye 123 or BIN primers are stain blockers that also are suppose to adhere to a glossy surface without prep. Does any one have experience with these products? (of course none of these products have Rust inhibitors).