RE: Fiberglass work?
Yes you have to grind away the gelcoat. Not sure I understand your second question. Regarding the last one, the proper way to do it is by steps of 3 layers. This maximises the bond and the strenght. More layers will generate too much heat and this can cause your piece to melt or even catch on fire. You start with a mat then a wooven then a mat. Repeat as necessary to achieve desired thickness and strenght and voilą.
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