I've also used RainX. I think that the 3 part Diamondite system fits in a completely different catagory than RainX. This system will remove the spots and contamination which RainX does not. The final product is advertised as a "chip guard" that is supposed to resist rock chips. I know that RainX does not make that claim.
RainX actually works better at repelling water which is what it is designed to do. I may try putting RainX over the Diamonite when it starts raining this winter. (do you believe that . . . no rain in the Northwest).
Diamondite has worked as advertised for me.
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2003 Electric Blue GT. Mods - BTG lowering springs, Polished Blane hood struts and hatch strut covers, chrome door handle scratch guards, molded rear splash guards, BTG polished strut tower brace, BTG axle back exhaust, K&N drop in air filter with baffles removed, Royal Purple synthetic motor oil and K&N filter, Polished front and rear sill plates, Chrome \"PT CRUISER\" rear license plate frame, chrome door spear covers, Chrome antenna bezel, Get the BEST detail products from Gary here: http://www.perfectautofinish.com/
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