Here's my position. Collected Ocean 29 Sep 23. Watched this thread throughout.
4-5 light to medium rain tests on the drive, back to the light wind, 9 hours in total. No ingress. Watching this thread, I took the plunge and applied water-based seal sealant to front seams only and Fabsil fabric protector to the front. Nothing to the sides.
5-6 nights on dry campsites, obviously no problem. Then 2 nights in a wet Welsh campsite with the Cali facing north, with wind and medium to heavy rain from the west. (I couldn't park with the back into the prevailing westerly wind). Nearside (west) side panel seams started leaking on the right edge after 20-25 minutes; not heavy but consistent and would have continued all night. Front seam (sealed with water-based sealant) one or two very slight and sporadic drips after 45-60 mins. Nothing on the offside (east) side panel. I closed the top - no saturation experienced.
On return, I told my dealer I had a leaker and was honest about the front seam sealant, knowing it might impact the warranty. They are now investigating what the VW position is. I decided to plunge deeper and treated all front and side seams with the Fabsil polymer based seam sealant and both sides with Fabsil waterproofer, just to see if this will work and avoid the ongoing replacement bellows saga. This will be tested on a 4 day trip next week in Lancashire.
I know that VW may well say Tango Sierra and I've invalidated the warranty. In that case, I have several options:
- The Fabsil protection works.
- Always park the Cali back into wind
- Use the Comfortz cali topper I have (bombproof but a bit fiddly to put on, especially for a single night)
- Pay for a replacement bellows. This means I can wait until it's clear which OSx version really works and I can demand this is fitted.
Next week will be interesting...