Tim,

Apply the filler coats as soon as the last coat is cured to the non-tack stage. Usually you want to put all fill coats on within 72 hours for the best chemical bond. If you wait longer than that, sand with 120 to get a good mechanical bond.

Brad

: Yesterday I laid out the fiberglass cloth and applied the first coat of
: epoxy. I am using U.S. Composite's 635 thin epoxy with the slow hardener.
: The drying time says 24 - 28 hours. My question is can I apply the second
: coat without sanding as long as I am doing it within the drying time
: stated?

: Thanks, Tim F.