I pressure-washed the engine area in my 310 Searay, then hand-scrubbed it with brushes and degreaser to get it clean enough to paint. Also, I removed all mechanicals, plumbing, and wiring as this was a long-term refit (18 months) of this boat. I considered using epoxy but decided to use Bilgkote because it was less expensive. Overall, I've been happy with the Bilgkote but it has an extremely long drying time. If I were to do another one, I'd use the two-part epoxy. My Searay engine space was dark grey originally so repainting with the light grey Bilgekote made a big difference.