Which hardner works best for applying glass cloth. I have not used the West System before, but think I might on my current project.

I use the regular 'ol 5:1 #206 Slow hardner for everything. Fast shoots in about five minutes and that is no good for working out the bubbles with a spreader. At least not at my working speed. Slow lasts maybe 20 minutes, and can be "retarded" by chilling a little in a cold water bath.

I use the 206 as well. I mix 1 pump of resin and hardner at a time. At the pace I work, it seems to be about the right amount for the working time of the 206.

Scott