They were both very similar
I selected the 5 because of the shorter set up time. I go through more tips but it allows me to build up the area faster (at least that’s the plan when work and weather don’t get on the way of my hobby

You are correct on the fiber, it will be applied overtop

The wing is not fibreglass the gel coat is approximately 2mm then you are into the solid core.
The coating is
-PUR-GF17
The core is
-PUR-GMK

I could not find a reference anywhere to PUR-GMK so I decided to use #5 as I’ve used it before and like the results.

It’s a small area and I’ll be building it up to attach at the top edge of the wing. Ultimately it will look a little different but will be much stronger.

Seeing as it’s a clone the only one who will care is me

In my city there are only 2 other SRT Roadsters. They’ll know but they may also have the same problem and be interested in a fix.

Great point on the 15, it could work as well.

I’ll post a few images once I build it up and after I apply the finer