https://sikaflexit.wordpress.com/201...-your-caravan/
https://sunworks.co.uk/product/solar-panel-adhesive/
Straight from the manufacturers website. What would be interesting is if the correct grade of sikaflex was used (or even if it was Sikaflex 252) and it was installed to the manufacturer's guidelines and instructions. I have used Sikaflex grades under some wicked applications, but to be honest, am a bit gun-shy on the solar panel stuck to roof config., but the manufacturer and others say its fine. My panels are bolted into a frame and then bolted to the roofrack. 50,000klm and still there!