Quote:
Originally Posted by perryg114
Yeah they stopped putting Methanol in the washer fluid in the summer which means you are just putting colored water on your windshield in the summer. It is a ripoff. Make sure you get the winter formula with Methanol in it.. Just don't drink the stuff or it will make you blind. I am not sure how Methano is going to effect your seals.
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Some rubber compounds have good resistance to alcohol. Others do not. Natural rubber does not have good resistance to alcohol. Butyl rubber is a little better than natural rubber, but still not ideal.
Nitrile rubber, AKA Buna-N (the kind used in many surgical gloves) has good resistance to alcohol, which makes sense when you consider how much alcohol is used as a disinfectant.
I'm not sure what type of rubber is used in the tank seals, but I'd guess it's butyl rubber because it has good resistance to the chlorine used for sanitizing RV water systems.
If the rubber does not have good alcohol reistance, the alcohol will dry out the seals, just as badly as if you used nothing at all.