The best replacement for gelcoat is acrylic.

The best alternatives to gelcoat are rated as following:
★★★★★  acrylic
★★★★★  paint
★★★  awlgrip
★★  flowcoat
★  clearcoat
★  epoxy paint
  bottom paint
  marine tex

Your alternative for gelcoat is not listed? Suggest!
Speaking about gelcoat, one probably shouldn't forget about preval.

Other search terms related to gelcoat and their ratings are:
★★★★★ preval
★★★ duratec
★ preval sprayer
You have in mind a companion for gelcoat and it is not yet here? Propose!



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gelcoat
acrylic
paint