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I think when I was watching a spray application, they had a roller to measure thickness. They were targeting .020"

Just got my 1st boat about 6 weeks ago. Was really babying it until I starting repairing some Gel Coat areas on the hull. That fiberglass/Gel Coat structure is really tough.

If I am not mistaken, you'll need to cover the large spray area with PVA that can also be sprayed with the same type sprayer. It's a water soluable plastic film so the Gel Coat cures. Let the Gel Coat set up a little, then apply the PVA. (Poly Vinyl Alcohol). Smaller areas can be covered with PVA, Seran Wrap or Mylar sheet stock. I really found the PVA the easiest to work with.

Doug

Doug