RockinNRollin
Where to next?
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There must be concern somewhere (either VW and/or their supply chain) about the use of waterproofing agents or else surely they'd just endorse it? It would be so much cheaper than repeatedly replacing bellows and given tent manufacturers have long said that periodic re-proofing is "normal" means that it's not like VW would be setting a precedent by having something that needs periodic treatment.
My guess is there's uncertainty about how the material/thread/sealants will interact with proofing agents, with the supplier (or the material supplier to the bellows manufacturer) refusing to give a cast iron guarantee that all will be well, i.e. "progress at your own risk" and VW don't want to take on that risk themselves, hence are unwilling to tell their customers to use such treatments.
My guess is there's uncertainty about how the material/thread/sealants will interact with proofing agents, with the supplier (or the material supplier to the bellows manufacturer) refusing to give a cast iron guarantee that all will be well, i.e. "progress at your own risk" and VW don't want to take on that risk themselves, hence are unwilling to tell their customers to use such treatments.