Teardrops n Tiny Travel Trailers

I was looking at all the different types of KILZ primer on the HD website to use on the shell of a foamie I'm planning and...oh, my. So many different types! Which primer would be best for the poor man's fiberglass (of any brand, doesn't have to be KILZ) or is any old exterior latex paint sufficient?

I used oil base primer over my underlayment and oil base top coat. I've always thought oil base would be more waterproof for a wood boat so I thought it would be best for my camper that sits outside in the rain. There are high bond primers that stick to glass, both oil or latex. Figured the high bond would be the best for me.

Glidden Gripper seems to be the standard for most builds here. And yes it will stick to glass.

Thank you!