Looking at the picture the are definitely not using fine line tape and they should not tape on the textured area you will never get a sharp line. Tape in the groove where it is smooth. Look at the original bumper you will see that's where the factory tapes there line. As an automotive painter I...
Raw plastic bumpers
Factory plastic bumpers from Toyota do not come primed. The area that stays black should be taped 1/8 inch back from the final tape line. Then use 1/4 inch fine line tape to create a straight sharp line. Scuff bumper with fine scotch brite pad. The important step is to apply...