Re: 1998 Bayliner floor repair, I made a mess...
If you want my advice......
An angle grinder with a 100 grit flap disc will remove ANYTHING.

including fiberglass and resin.....a light skim over with that sanding disc will clean it up nice
.....Harbor freight has grinders = $15 handy as heck!
is the "goo" drying up after a day or so? the goo might gunk up the flap disc.
a quick light coat with fiberglass resin and a foam roller or brush will leave you with a NEW surface, buy resin by the gallon for $35, since you are already fiberglassing some stuff, quarts dont last long!! get some paper dixie bowls and a couple cheap 88 cent brushes from walmart or wherever..
...I dont use the plasic ones but the horse hair looking ones, they hold up great.
if you have a small plastic cap that comes off the fiberglass resin cans, use a little acetone in there to soak your brush in between working on it and waiting for areas to dry, that way the brush is usable for many coats. (yes we went through about 30 brushes for our first boat rebuild) and learned that one the exspensive $$$

way
and...you could....
paint with truck bedliner paint, or an oil based gloss paint and leave....
lay down throw rugs (I've seen it, works pretty good) if you want some padding for bare feet
also you can add silica sand to the final coat of paint for a non skid surface.
if you want something to cover the side areas where the carpet used to be, you can spray glue white vinyl upholstery material...check your local craft places, Walmart, Joanns etc, 3M headliner and carpet spray works well.

Hope it helps! .............