newbie repair alert!!!

Hope you can help a newbie in all things surf related.
I have recently purchased a second hand foamie for my missus to learn to surf on. It's kinda got black rubber edges, plastic fins, a blue rubbery top and then a white plastic sheet for the base. It's polystyrene in the middle.
We were having a great time and doing really well out a Rhosilli recently...until that is the plastic sheet base came away from the rubber edge at the nose end. Before we knew it, basically half the base had peeled away from the polystyrene!!!
Anyway, I'm not too bad at DIY and would be happy to give a repair job a go, and it would only be to get her through this summer I reckon and then she'll be onto a mal. Thing is, I really don't know what to use on it to stick it back on or if this is even going to be possible!
I'd be really grateful if someone could tell me to either bin it, or if feasible, what to use to repair and where to get said glue etc!
Cheers in advance
I have recently purchased a second hand foamie for my missus to learn to surf on. It's kinda got black rubber edges, plastic fins, a blue rubbery top and then a white plastic sheet for the base. It's polystyrene in the middle.
We were having a great time and doing really well out a Rhosilli recently...until that is the plastic sheet base came away from the rubber edge at the nose end. Before we knew it, basically half the base had peeled away from the polystyrene!!!

Anyway, I'm not too bad at DIY and would be happy to give a repair job a go, and it would only be to get her through this summer I reckon and then she'll be onto a mal. Thing is, I really don't know what to use on it to stick it back on or if this is even going to be possible!
I'd be really grateful if someone could tell me to either bin it, or if feasible, what to use to repair and where to get said glue etc!
Cheers in advance