True. You just get white crust. When I'm in a hurry, I touch edges of a joint with a slightly damp piece of cotton. A polymerization wave then sweeps through t

True. You just get white crust. When I'm in a hurry, I touch edges of a joint with a slightly damp piece of cotton. A polymerization wave then sweeps through the joint. As I vaguely recall, that's how we used to set polyamide resin for boat repairs.