I'm in the process of refurbing some old rayglass fibreglass trailer guards. They are currently gelcoated rayglass white. I want to redo them in a black gelcoat, what product do I need. I've asked a couple of suppliers but haven't got a reasonable answer.

From my understanding for gelcoat to cure outside of a mold I would have to add wax to it or use flowcoat is that correct? Which product would be best to use?

Product I am looking at is this: https://nzfg.co.nz/product/black-gelcoat/

I've never done more than just touch ups with a gelcoat touch up kit so any advice on doing the larger area would be greatly appreciated.

I had to make some mojlds for a project a work. I went into NZF and talked directly with them. They were really helpful. I suggest calling in there and having a yarn. Might be more productive than a phone call. Especially if you can take the trailer with you. Their advise was bang on.