You can apply additional coats of finish epoxy (two part, not urethanes) once the previous coat is no longer so tacky that the brush or spatula would stick/drag. The exact amount of time is VERY dependent upon the thickness of application, formula used AND temperature in the room.


Without taking special steps, you MUST apply any additional coats within 24-36 hours, give or take, depending on the exact formula AND environmental conditions. The reason is that additional coats have to chemically bond with previous coats or delamination of layers can occur. The safest bet is to apply additional coats in the 6 to 18 hour range, but not more than 24 hours.

IF you don't apply additional coats before any previous coats reach the point in the curing phase that proper adhesion wouldn't take place, you MUST prep the existing surface coat. Preparation of the surface coat is done by lighting abrading it to achieve a surface that will allow "gripping" of subsequent layers. This is no different in theory than doing proper preparation for painting of various materials.

TJ -