gluing polystyrene foam

it 's now over 10 hour's an the white glue now seem's to be holding ., I just didn't give it enough time ., thank's everyone

Ditto that !  T.B.

Elmers works a charm

3M, Elmers and Gorilla Glue all make foam specific glues. Frankly, I never bothered with any of them because the wood glue and pinning works well for me.

it's the white gear they use for packaging ., blacksmith ., about 20 mm thick

If that's the purple stuff they use for insulation, I've used Titebond II wood glue with great success. You can use T pins to hold the pieces together while the glue sets.