I have been thinking about doing this, but i didnīt for the following reasons:
-Good solar panels use special coated glass that reflect little light. Normal glass reflects a lot and cuts down on the efficiency. Gelcoat or whatever you put on there will undoubtetly be even worse than normal glas. If you make it antiskid, it will be downright terrible.
-Even little pieces of shaded cut down a lot on the energy output.
-Solar cells are very sensitive to crackling. I dont feel safe walking on them and maybe sometimes dropping pieces of stainless equipment or tools on them.
When i buy myself a campervan and i wont be dropping **** on the roof, walking on the roof and dont need anti skid, i do however intent to do this. Simply because cells are cheaper than panels and this way i dont need to build frames.
Sorry for not believing in it, it sure looks cool, and who knows, maybe im wrong