Fix Broken Front Splitter/lip

Well guys,

As the title hints, I had a big brain moment and snapped a bit off my front splitter.

Its a Maxton Design front splitter/lip. made of just plastic.

Luckly it was a clean break, I recovered the piece and it fits back in place perfectly.

Could anyone suggest the best way to go about attaching it back on? Like what sort of glue to use or what ever.

I was recommended to use fibreglass to fix it back together, this the way to go?

Just dont want to end up loosing the piece because it fell off due to driving over bumps in the road or anything like that.

Thanks.