Depends what the dash is made off.
elmers white glue works best! brush onto both halves, put together and secure with tape or rubber bands.
PL 200 will do this best, but does need to be supported somehow till it sets.
Theres a product called flex zap glue from this site (FreshDeals.com). This glue works very well with securing a model car and takes about thirty to ninety seconds to dry. The best part about this glue is its moisture and solvent resistant characteristics which is the main reason its ideal for this project of yours.
it has to be secure and it has no glue on
Glue it or screw it.
If you intend to secure your windows, screwing the frame is better than glue.
Silicone is best for that.
DUO eyelash glue is the best.
only the best GORILLA GLUE
Yellow carpenter's glue is best, white glue is OK.
it is best to use decopatch glue but i am trying PVA it should work
With white glue or a glue stick.