Originally Posted by mikebontoft
always wondered if it will get tree sap off. In fact I need to clay bar my truck before even trying to buff it. its ok to use soap and water misted as a lube, right? or does it destroy the clay?
Depending on the soap (tons of options there), it can degrade the clay. A bottle of clay lube or quick detailer isn't that expensive so that you should risk it. Clay lube gives you the right amount of lubricity, soapy water may be too slick and take away some effectiveness of the clay.
As for the amount of pressure while claying ... start with hardly any pressure at all. You'll feel a slight drag when the clay is picking up debris, and you'll see it on the clay when you turn it over to look. If you have stubborn tree sap, you can add pressure to see if it improves your results. In the end, if clay won't take it off, like in the case of some tree sap, you will need plan two (alchohol, paint thinner, compound polish, ...).