I have always been taught that the reason RainX interferes with good repairs is because it interferes with the bonding between the resins and the glass.
Lets look at a bullseye
Rain X Question
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Anonymous
Rain X Question
In hopes of not being too scientific or technical.. I believe the answer is quite simple. Rain-X has a petroluem base.. Resins will not adhere to a petroleum coating.. Why is it normally occurring to the pit surface area? Rain-X is applied very thin.. I believe the bottle states "USE SPARINGLY". And it evaporates very quickly. Thus, the combination of being applied thin and the evaporation factor would lead us to believe that a very minute amount of the Rain-X product actually gets into the break area. However, much like a drop of water, it can lead to disasterous repairs, long term. There is no known solution to preventing this problem if indeed the break has been contaminated. Surface Rain-X can be removed with a cleaner, such as the Step#1 cleaner that JanVil sells.. Hope this helps.
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