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"The glue melts the plastic together through heat which makes it contract after expanding."
Uhhh, no.
CA bonds by mechanical adhesion, no heat, no solvent. Heat is sometimes generated by the application of accelerator, but that heat is not bonding by melting the plastic. No contracting and expanding.
Solvent cements bond by chemically melting the plastic together, no heat. No contracting and expanding here either, except long term shrinkage due to solvent evaporation.
Soaking in water then freezing for a few hours (minimum) allows the water (ice) to expand within the joints, slowly prying some pieces apart. Ever forgot to take a beer or soda out of the freezer? Expansion.
Seems to work best on old solvent built models, but can work in some cases with any type cement... - Mark
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