+1 651 has been a favorite to use,
+2 for me on the 651
the only place i have had some issues with this is on the hood of trucks
(you are fighting the sun and the heat from the engine but i still get about 1.5-2 years out of it before i have to change it. and the customer pays me to replace it)
we had some issues with some LG calandered also and LG rep came in and went through their materials to find one that was right for us but i am getting to the point where the amount you are saving isn't worth the hassle to have a job come back and all the testing you have to do to make sure it works (if it's not broke don't fix it)
if i am going to save a large amount $$$$$ on the material then i will consider it