How to apply marbles to outside tabletop.
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Are we talking round marbles or marble gems that are flat on one side?
You will need to use a marine clear epoxy
You can glue them with E6000 but it's going to have a very bumpy surface unless you grout it. Even if you grout it, the surface will not be smooth. Best of luck!
Make sure whatever you use will be able to stand the heat and rain you get during the summer months. Another choice may be to use an automotive silicone that can withstand the heat of an engine. It should be durable and withstand the weather.
E6000 is great for attaching two different surfaces together!