Don't use Acetone with West's. I use the base 105 and the 206 hardener. Works great. About an hour working time. Tacky out to about 2 to 2.5 hours. Trim it while green at the 7-8 hour mark, at which point you can work with it as well, such as sanding, etc. Reaches max hardness in 4-5 days.

Lance