Kayleigh
Back in the ‘non-leaking’ T6 Beach
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The fabric itself does appear to have some kind of hydrophobic coating already. When it first gets wet, you look at it and think it’s impressive how the water just beads off. Unfortunately, it doesn’t stay like that and then starts to soak up the water.But in your post number 686 you said " It requires steady saturating rain for best effect. Gotta get the outer layer completed sodden and continued rain to allow the water to wick through the seams."
If the outer layer is getting sodden it's not waterproof. A coat of something hydrophobic would make the water bead & run off to stop it getting sodden the first place. Others have mentioned the bellows changing colour thats due to the water soaking into the material, nothing to do with the seams. A spray of fabsil or similar may well solve all the problems......
I think the Achilles’ heel of the bellows (even if using fabsil or similar) will be the arched windows.
1) The arched window zips are already covered by a flap, which is normal practice for non-taped zips on tents, however, this is the first place the bellows will leak. Water runs down the zip and drips form at the corners. This is a seam leak as shown in the video:
2) The lower seam of the windows leak once the fabric is overwhelmed by the volume of water. This is a saturation leak.
So the problem is twofold. Has anyone seen any other tent products manufactured from this bonded two layer fabric?
My Goretex Pro jacket for example is a multilayer fabric. It has taped seams, taped zips and a water repellant coating. It’s a fantastic jacket, but if I stay out all night in the pouring rain, I’m pretty sure it will eventually leak.
And there lies the problem with the fabric VW have used. It will need taped seams, taped zips and regular application of sealant to prevent it leaking. Even with a regular sealing regime I would not fully trust the fabric myself for prolonged periods of rain without a topper.
Disclaimer: This is my personal opinion and conclusion from my own testing and research.