Q: Why the curing speed of two packs silicone sealant in a thin layer is slow, and need to rework?
A: That is a common unfixed trouble, mainly in two reasons.
1. The crosslinker is easy to volatilize when the sealant is pastered in a thin layer, which will cause the crosslinker not enough.
2. The amount of catalyst is quite small used in two packs silicone sealant, and the content of the catalyst is even smaller when the sealant pastered in a thin layer, which causes the catalyst ineffective, and need to rework.
There are two ways to solve that problem.
1. To increase the content of the crosslinker.
2. To use the crosslinker with less active and heavier molecular weight to limit the volatilization and increase the content of catalyst.