It would be sort of awkward to have this fight without pants and worse to pause mid-combat to replace all and only the parts of his pants that need replacing and worse still to wind up in several layers of pant. So the acid is interrupted by liquid nitrogen. Okay, if cement won't do, does Cam have to launch him into space? How much does Crawler even weigh? This neighborhood might be a little too inhabited for a rocket and if Cam tries to put him in some other sort of chassis he'll just break out -

Maybe Crawler can be tangled up in carbon nanotubes?