I couldn't find any styrene locally, but Mariner Sails found some in Houston and I should have it in two days - another example of what a conscientuous dealer can do for you, but that's another thread. I plan to mix the gel 1:1 with the Duratec High Gloss Additive, then thin with 10% styrene by volume. I found a 2mm gun locally. Does anyone know what affect the Duratec has on the gel - thinning, thickening, or neutral? Does this plan sound like it's on the right track?
The Duratec will thin the Gelcoat. Sounds like you have a good plan, its exactly what I did and the boat came out great.
FWIW I let the boat dry/harden for 12hrs in 75 degree controlled temp garage, then started sanding again, and didn't have any issues.