Hi does anyone know how to glue on a roof spoiler that attaches to the top section of a glass tailgate? I bought one from Reiger which came with Sikafix adhesive and a small tube of something else, not sure what its for - perhaps an activator or something. Basically all the instructions are in German and there were no pictures either. Just wondering if anyone else has used this stuff or suggest anything. I've heard of some people using 3M tape but I'm not convinced!