...I have been using my three IPs for 7+ years, never have I had a burn notice...once you understand the concept.of.pressure.cooking and how to work with different foods, it all makes sense...also, I take my lid apart and clean all parts after every use, about 4 times a week, still all original...I have.never used the PIP method, other than for the obvious, such as cheesecake, egg bites, flan...