I’ve almost always used Aquatech screen printing colours, Screen Sol-rm Blu emulsion and Strip concentrated solution (diluted) to clean the screens.
I recently had to use Plastisol inks, again with Screen Sol-rm Blu emulsion and the screen cleaning solvent to remove the colour when I finished screenprinting.
I also used a heat gun on the screen printing press to dry the ink between one layer of ink and the next.
However, sometimes the screen can’t be cleaned, it’s as if the emulsion is completely catalysed and stuck to the mesh.
If they come into contact with acids or are exposed to high heat, all emulsions catalyse and become impossible to clean.
Indeed, in reality, emulsion catalysts are nothing more than an acid compound.
Since the solvent you used to clean the ink is a product specifically designed for that purpose, we are left with the only possible conclusion that the cause of the problem is the heat treatment.
Therefore, if the ink isn’t completely dry, we recommend that when you use the heat gun, you do so at a distance away from the mesh.