does anyone know of a good glue to stick down decals that have started to peel off?

grip glue is awsome! I use Renthal grip glue (mostly on my grips) but when i use it on a decal it's awsome!

Thanks for this tip, I restuck some of my decals with an old tube of 'grip glue' found in garage, and yes they are well stuck!.

It seems to be like Evo-Stick which is petrol based so if I continue to splash fuel all over the tank decals as usual they may come away again. but still plenty left to stick em again