Which has proven to be best? I hear POR-15 takes multiple applications of different solutions like UV inhibitors,etc.-but i do hear it is the best if done properly especially for non-UV exposed areas like frames,etc.....Of course everyone has heard of Rustoleum,...but what about Hammerite from the UK? I hear this stuff is the equal or better of POR-15 without the multiple processes....What are all your opinions of these rust-sealing/covering paints? thanks again all