Its not exactly cheep if you start with the right recipe.
One thing I did that I did not document well was chopped CF and epoxy mix to fill the inner corners after the gel coat flashed over.
The chopped CF is cheep and don't take much to make a past.
I used it in the corners cause I thought it would strengthen them more than the powdered CF.
The dificulty with the chopped CF mix is it trys to become one. Like a wet mop.
It took some time to get it to lay well in the corners but I think the effort was worth it.
Once I got it to lay in the corners. I spread another layer of epoxy and went right over it with the glass.
Kevin