I would be taking all the gel off yes.. not sure id peel it on such a thin hull though, unless you set it just deep enough for most of the gelcoat then finish with a grinder or DA.
Never used the 422 but any laminating epoxy will be a better true barrier coat than interprotect or the like…
If the glass underneath the gel is in real bad shape you might wanna put a light layer of cloth down to keep the original stuff from “checking” thru the new shiny paint job. Epoxy use a surfboard cloth, some people will do an entire layer of mat too if theyre using the smelly shit.
Are you putting bottom paint back on?
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