Which one did you use? I am 2 months in and they still look new. There are loads of rave reviews on loads of the forums about it - people say it lasts years. Can only assume you bought a different product?!
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Smooth peanut butter
Defo wurth we have it at the bodyshop and few people said it's not good.
I used the wurth stuff on my mk1 bumpers and it nearly ruined them they went white after a few month looked like frost all over them .
I have been looking into this and it's getting mixed reviews, dies it come in any different colours as black might be to dark for his skirts?
Boiled linseed oil. Pisses on everything else.
Rain-X
Linseed oil is awsome stuff i have also used it on my transit bumpers lasts for ages