As title.I need to bond together several blocks of the EC low density foam

This stuff https://www.easycomposites.co.uk/low-density-polyurethane-foam-block

Can anyone advise on the best and strongest adhesive to do it?

the problem with hot glue is that if you need to sand into it, because it is much denser than the foam it will be hard to sand the area where the glue is without leaving a ridge.