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 Most dollar stores carry gel glue.  Works well for me. and at $1 for 3-5 ml your not buying $50 worth of glue that hardens before you get to it.
 I've used Extra thick Glue from the Hobby shops before, but its still too thin to build up a decent size glob that can then be taken under water.
 
 Ecotech glue is suppose to be the cats ass though.
 
 Concept stocks it.
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