Chuck, the acetone is too strong and will soften the gel coat before you get
the cetol stain off.

I have been able to get small droplets off with a razor blade.

However, last season, I had an old run that had been there for a couple
years and I rubbed it off with lacquer thinner. I was surprised it worked..
Perhaps because there might have been some wax residue on the gel coat..

Also, another tip, for getting fresh or semi set 5200 off glass and gel coat
surfaces.. Mineral Spirits.. It cleans up the messy ozz-out and won't
penetrate the the sealant/adhesive or effect the seal. Also good for
cleaning your tools and hands without the hazard of acetone..

Steve
s/v Good Intentions
s/v Good Intentions