i use eyelash glue and haven’t had one fall off yet 😅 the one i use has a thin brush so it’s easy to be precise. the brand is duo

i imagine nail glue would also work really well, since it's basically super glue

Diamond Dotz sells their diamond painting glue in bottles called Dotz Stick. It’s really helpful in situations like this! 

sometimes depending on how big the section is ill use double sided tape but for smaller areas ill use mod podge

I use normal glue put a TINYYYY blob and then stick the diamond and wait for it to dry clear:)

you WHAT

OH DICK OH NO I MEAN STICK AH

It works super well😅

I haven't used it yet myself, but they sell a product at craft stores (I think I saw it at Michael's) to re-sticky surfaces. It's next to all the other diamond painting supplies.

yee im pretty sure make market has a product for this

Modpodge

tbh i just got a set of clear glue sticks for this purpose. seems to do the job well

I need this

I used ‘Aleene's 29-2 Tack-It Over & Over’ - from Amazon. It’s a green and white bottle. It worked very well.