Here's a trick I use when using glue. Put a blob of glue on the plug and then put the plug under water for a second or two. Then pull it out and put a little more glue on top. When you go to attach it to the rock don't just push it in place. Twist the plug and scrape it around on the rock a little till it really sticks. The problem with most crazy glues ( Ecotech excluded cause ive never tried it) is that as soon as you put it under water the glue forms a skin around it that isnt sticky at all. So scraping it against the rocks pops the bubble of glue and sticks much better.
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