I agree with every response and would add this link about using the porter cable as well.
http://autopia.org/forum/guide-detai...-polisher.html
I have been using the liquid Klasse products for some time and with the porter cable I have had no problems at all. It saves time and does a better job using the porter cable. I have been through 3 cars now with the Klasse all in one and am very pleased with the results.