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Reply to "Adhesive?"

Either plain old white glue or the Tacky Glue will probably work best. Liquid glues will form a better puddle of adhesive and get pulled up into small gaps by capillary action and to a better job of holding irregular-shaped stuff like gravel/coal bits. Tacky Glue's advantage is that, like its namesake, it's tacky and not entirely permanent so it's easy to remove what it's holding and then clean off the residue with water. Traditional white glue holds tighter, but can still be rubbed off/peeled off from smooth surfaces and the rest generally comes up with more vigorous application of water and scrubbing. Pick what seems to be best for your use.

The 3M spray adhesive is great for flat surfaces with a large surface area. (One of its primary uses is as a pressure-sensitive adhesive substitute) How well it works on irregular surfaces varies, often depending on how much liquid you can get to build up so there's enough for the other surface to pick up. On exposed surfaces, it may eventually dry out, loose its adhesive properties and flake away.

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