Hi all, after some help please…

Hmmm, this is going to be a hell of a lot of work no matter what way you do it I'm afraid. There just isn't a way to apply it smoothly enough that you can get away without rubbing it down, and gelcoat is very hard so it isn't easy to flat. Perhaps with a DA sander you may save some hours, but even then... May I ask how you intend to apply your reinforcement? 

Does it have to be gel coat? If you're trying to make a smooth hard surface for the part, you could mix up poly resin and talc which is easy to sand and sets hard

Hi guys, its just a 200mm wide channel I am making, rather than using EC Primer I thought I would have a go at using the mould making materials as this is what it is designed for, maybe not the application, but as a surface for a mould. I know I will still have to do some rubbing down, but as you've stated its tough stuff and takes some rubbing. I do have a DA sander which helps, but its the application using a brush that makes it so much work, there must be a better way of applying this so the surface is flatter??

You could try applying it by brush, then using a spreader to flatten it out some. But even that is going to be frustrating.

My first question on using the unimould gelcoat would be can it fully cure when exposed to an "air" environment? Most gels won't (well poly gel won't) I've not tried a vinylester  gel before so don't know the ins and outs of it.

He did say he would be using the wax additive so it cures hard. 

Ah, didn't spot that....