Any product will do, but I'd be looking at the marine based ones for durability and yes they are all 2-pot mixes. Its the same stuff you can use as bedding compound in rifles, so it can take impulse loads like a gun-shot will produce.
Not most epoxy resins are clear (no colour) but you can buy tinter in any colour you want i.e black!
You may have to do a little trial and error testing, but you'll figure it out.
kj
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