Sikaflex Adhesive

peegeenine

I am about to bond a flexible 100 watt solar panel to the fibreglass roof of my motorhome and am confused about the different types of sikaflex adhesive. The panel is not in a frame and is just like a plastic sheet so bonds directly to the roof. Youtube
clips suggest 552 or 252 but my local stockist only has 512, so my question is will 512 do the job?