The bond is instant, but letting it cure would be ideal. I personally let stuff cure open to air at least a couple hours if in a 'rush', but ideally 12-24, for safety sake, and to let any vapours/fumes etc... dissipate(although im sure that happens much quicker).
Chris
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No more tanks  - Laying off the ReefCrack for awhile!
Cheers,
Chris
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