I'm almost through laminating a new mast beam to replace the old plywood beam. Using resawed white oak and african mahogany. I having been using one coating of 205206 neat then same mix with 403 and mahog flour for color. I don't have enough 206 hardener to finish the job but I have fresh 209 and 207 for a spring project New ply deck on my Cal 25. Basement temp is 52-58 degrees. The slow hardener is curing without a problem. I'm concerned with using the extra slow because of its minimum recommended cure temp-70 deg. I have enough 207 hardener to get the job done. How well will that work with the fillers and cure? I don't really want to get another can of slow at this point.