What would happen if you used the IR stripper on bitumen - a very rapid and uncontrollable fire that smelled really bad?
Have you tried going the other way and freezing the blocks?
The bitumen should become fragile and the difference in shrinkage between the wood and bitumen might break or at least stress the bond.
@Emyr started
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What would happen if you used the IR stripper on bitumen - a very rapid and uncontrollable fire that smelled really bad?