really the only tips are don't breath the fumes from the liquid, use in a well ventilated place, and make a marble like in the video so you can see how the stuff cures and the stages it goes through. For fixing PVC wait until it is almost honey like pout it in the leak and then as it continues to thiciken add more and shape it (just like in the slideshow). It's pretty straightforward and easy stuff to work with once yo get used to it, which is why I say make a marble like in the first slideshow. http://www.plast-aid.com/applications/marble/marble.htm