Same as Nog, I find the resins usually crack pretty soon after using. The vibrations and the clamping tension seems to get the better of it, but I there's probably plenty of products out there I didn't test either.
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Melting works, and 'steel staples' (heated electrically till they glow red hot, and then you embed them into your workpiece to stitch pieces together. A cheap Chinese kit was done me well for a couple of years.
Cheap kits are £15 on ebay, may or may not be fused. May or may not be the correct fuse. Live may be neutral. But it's just 15 quid !
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They work like this
https://www.youtube.com/watch?v=jEFziK8brwQ