Most polypropylene plastics will whiten and worse break when bent really hard.  Not with kurvyflats!  Our plastic cocktail is formulated to resist the nasty stress developed during the compound 2nd bending that is needed to form the curve fender.  It also resist breaking when your kurvyflats get caught & pulled hard while riding.  You may break the 4″ zip ties as it is the weakest link but will save your mudguard.