The xps blank foam for the current project will need to be cobbled together with large pieces, then shaped. the glue joints will be long and no doubt in difficult places like concaves and rails. System 3 PU glue has worked good for sanding before but its not very available, I've heard Gorilla glue is rubbery to sand?? How about Elmers PU glue?? I'm going to test using blow can foam, it will sand good but might be too low density for a strong joint and the foaming might be difficult to clamp tight. Any ideas? Thanks
sumo glue
or
roo glue
Gorilla glue sands fine. Just make sure one surface is sufficiently dampened when applying and its cured fully before you start sanding.