West Systems 206 hardener question

[Mark Canada]

As to your question about curing - please do your second pour before the first one finishes curing. It allows the two pours to chemically bond together when they are both still polymerising. If you leave it until after one finishes curing, you'll have to sand it first and then you just get a mechanical bond between the two which is nowhere near as strong

[Roger Bull]

Mark is correct. It is much better to pour additional layers before the previous layer is fully cured.

If you are going to pour another layer then sooner is better.