Repair leaky fiberglass roof?

Hey all...
Looking for options on repair of a leaky fiberglass cap. Picked it up used and it's branded as an ATC on the rear lift window.
It appears I have a bunch of tiny cracks in the fiberglass/gelcoat that allow water intrusion.
Truck is Pyrite Mica, cap is black so I'm not super concerned about color matching to the truck as long as it's black.

Quick fix? Long involved fix? Send it to the dumpster?
I've worked with fiberglass plenty before just never done anything with gelcoat.

Any fix will require recoating the cap so has anyone done this...?

Sand it down and spray something like Raptorliner? Would this seal well enough itself without fixing the tiny cracks? Is this stuff flexible/strong enough to seal and not transpire the cracks through? I can do all this at home to keep that cost down or take it for a professional job.

Sand it down and repair the gelcoat with gelcoat and repaint? Lots of tiny cracks all around so this could be time consuming and possible to miss cracks is spot repairing vs spraying gelcoat all over.

Vinyl wrap?

Other fix?

 

Seems like a massive messy effort with potentially poor results. I be worried about its basic structural integrity and the effects of freeze thaw cycle where you live.

Dumpster, find another used one.

 

Well, that is something new... I hope you didn't pay much.

I can't say I have ever seen a fiberglass cap leak through the fiberglass. Around holes and especially vents sure but not through the actual fiberglass.

I have never heard of a boat sinking from gelcoat cracks either.
I'm sure a boat guy will be around soon to give us some perspective.

Could you post pictures of the outside?

Your location suggests freezing weather occurs, remember water expands about 9% when frozen, unless this happened this year I would think the cap structure would be severely compromised.

 

Probably going the DIY bed line route.

 

Honestly, probably trash- I wouldn't want to sleep back there. That mold/mildew is going to be all in the fiberglass strands (looks like chopper gun construction) and that thicker section is usually a fiber (cardboard like) honeycomb material that's also going likely contaminated. If I were going to use it just for keeping stuff dry I'd treat it with whatever you decide then allow it to dry thoroughly before prepping and regel coating it. You could try bed liner but Either way I wouldn't be too keen on putting a rack with much stuff on it.

Side note, shells windows are expensive so you might be able to sell them and recoup your costs.

 

Quality points well noted. Not for sleeping in, just hauling gear.

I’m thinking spray it since I’m going to do my sliders anyways and scuffing up and prepping the cap isn’t that big of a deal for me.

Yea, chopper on the inside and I do have concern for the cardboard reinforcement so may continue to debate what to do.