Hey Rob, Looks like pretty small repairs, so it shouldn't be that big of deal. Not talking smack, but it looks like the previous owner used some type of filler (Bondo) and then just put resin (Epoxy?) over top f the repair. That's not the right way to do it obviously. This is how I would do it if it came to my shop:
Step 1. Grind all of that stuff out.
You never know what a previous owner used for the repair. That's one reason why I stress to always use the same material that the hull was made from for the repair. Gel coat will not cure properly over some epoxies. That white putty is probably Marine Tex (epoxy) and has no place on a Hobie other than a quick beach repair. Grind it out. No epoxy paint or bondo will be needed for this repair.
Step 2: Fix the substrate.
This will be the base of the repair, so it's good to do it right. Use a little glass and POLYESTER resin, might need some foam for the core. There are volumes written on this, so I won't get into it here. An outstanding reference is Rick Buchannan's article in the recent Hobie Hotline.
Step 3: Re-gelcoat and fair.
This will be the toughest step, since your hulls are blue it's hard to match the color. Base white polyester Gel with pigment is the way to go. Just eyeball the color and you'll get fairly close. Gelcoat is very forgiving. Slather it on thick, sand it down and buff it. You can trick the eye into believing that you actually matched the color by blending the repair into the existing gel. Basically, you'll fade the new gelcoat onto the existing stuff. Matching 30 year oxidized gelcoat is not easy, so you'll have to settle for 'good enough'. Again, Rick's article is a good reference for basic Gelcoat technique.
Step 4. Buff it and sail!
It's difficult to address every detail of this repair on a forum, but this covers the basic steps so you can research further.
Hope that helps.
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