>>6517112It's a putty that cures when exposed to light, like the package says. I think it's several minutes under full sun or something.
I use a UV spotlight I put together so it cures in 10-15 sec and then I can sand it.
You can also use one of those nail curing lights, 30-60 sec is enough to cure it.
The only drawback is that it needs to be applied in low light so it doesn't start to cure too early.