asianflava wrote:If you put on the second coat before it fully sets up (not runny but still sticky) it will bond chemically.
If it is cured, you could rough it up with sandpaper so that it can bond mechanically. When you sand, it should come off in white powder and not gum up the paper.
...epoxy can really sensitize your skin and breathing. It can be dangerous if you sand it before it is fully cured..1 to 2 weeks. Be sure to use an appropriate respirator if you decide to sand earlier than is recommended.
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