This is actually quite simple. British Cox glue gun shop has a lot of glue. Your gluing surface is relatively large, so choose a large-caliber rubber nozzle for employment. Look at these in the website store below. If I can help you, remember to contact the store. This is the website of glue shop.

/shop/6d 27 b 7266 a 39 efcc 2 1 1 18 CEB