On Friday, October 5, 2018 at 6:25:51 PM UTC-4, wrote:
That said just putting over old cracked gelcoat would be a poor decision.
UH

Why? Not challenging what you say, UH, just want to understand what the issues would be. I can guess some, but I would love to hear yours, much more of an experience base than mine....

Cheers,
J6

1- Unless enough of the existing finish is removed, there likely will be mass balance issues.
2- If failing finish is not removed, the failure of the finish will continue. It is cracking because it is old and brittle and shrinking.
3- Crappy under surface will almost certainly show through unless sanded smooth and flat.
"There has to be an easier way".
UH