Adhesive for glass fibre bath

[Roland Perry]

I have a perfectly normal glass fibre bath, and need to glue something (hard plastic) to the shiny surface.

What should I use?

[The Natural Philosopher]

Car body filler or epoxy resin. Hard plastic may not take too well though. certainly rough up the glue surface a bit

Also if the bath flexes a lot reinforce the back side with scrap sheet timber bonded with car body filler where you want to glue anything on the inside .

[N_Cook]

I decided to convert the fully smooth surface of a GRP bath into something like a non slip surface, in one smallish standing area. Cleaned the bath surfce, I don't remember if a light sanding from finest grit sand paper. Cut some 12mm hot melt glue rods into 3mm thick discs, with a thin sharp knife. Pencilled in some 15mm squares onto the surface. Generally heated the area of concern with a hot air gun and then one by one placed the discs on every other square and heated individually until they melted into domes. All the bobbles are still in place about 10 years later, having done an excellent job.