Most epoxies used in boatbuilding have "amine"-based hardeners. After the epoxy is cured there will usually be a noticeable oily residue on the surface called amine blush. The amount of amine blush can vary considerably, from almost unnoticeable to very oily. This difference is the result of differences in temperature and humidity. The amine blush can affect the bond of subsequent coats of epoxy or paints and should be removed. Although a variety of solvents have been used to remove amine blush, in the shop we use denatured alcohol (shellac thinner), laquer thinner or acetone. Amine blush can be sanded off, but will require a lot of sandpaper as the paper tends to clog quickly.

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