Once every month if your boat sits in the sun uncovered, or if you would happen to wipe down with wet towels a couple times in a month. Once every 3 months should be fine for most people. I think to much build-up is not good for the vinyl. I have been using the product for 10 years on clear bra on cars also and it seems to protect the clear bra well and keep it like new in the full sun for about a month otherwise about 2 months in the winter months. The price of 303 has really got alot better then when it first came out. I have heard great thing about hot sauce, so i gotta try it.
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