G'day Callum,

This is a DWR treatment, and Nikwax is probably the most reputable brand world wide for this sort of thing - you shouldnt have any issues, but I'd probably check with Thule directly just incase.
They may have a specific product they recommend, and will confirm if there are any warranty complications if using other treatments.

G'day Ollie,

Have you eliminated condensation as the issue?  It's unusal for material to leak if the waterproof layer is visually intact, along with the seam sealing.
At any rate, this Tent & Gear Solar Proof would be the recommended treatment for this type of situation, the Aquaproof is designed for heavier duty canvas or poly cotton canvas style materials.

G'day Stephen,

Its not, no.  The Nikwax product is for synthetic gortex style fabrics.
The best option for canvas tents & shelters is the Oztrail Aqua Proof, so that would be the go for your Darche AirVolution

G'day Ben,

Yep!  Tent & Gear SolarProof is the same product, NikWax have just had a rebranding of their labels which hasn't quite made it through to our stock yet.

G'day Maryanne,

Yes you can use this on sil nylon, it will work on most synthetic materials that have a DWR coating, and the spray will work to revive the existing coating.

G'day Brock,

Yeah, sure!  It's suitable to revamp the DWR treatment on any synthetic tent fly.

G'day Tanya,

Unfortunately there's no real way to make a nonwaterproof tent waterproof, as the waterproofing factors need to be worked in at the manufacturing stage, often for the fabric itself.
Whilst there are some waterproofing treatments around, these are designed to revitalise or repair existing waterproofing, and cannot actually make something waterproof where it wasn't beforehand.

I'd say your only real option here to ensure you have a waterproof camping experience would be to look at a fully waterproof tarp option to string up over your RV tent, creating an extra cover or fly-like set up. 

G'day Greg,

Yes, you could use this to improve the waterproofing of your Oztrail tent.

G'day Bea,

Yes, this should be fine to use on your Big Agnes Copper Spur Tent. It's designed for use with synthetic waterproof fabrics, which your tent fly should be.

G'day Des,

The Tent & Gear Solar Proof is designed for use on synthetic waterproof fabrics, so if your caravan cover was originally waterproof then theoretically it should be ok.

G'day Wayne,

Tent & Gear Proof is designed to add water repellency to synthetic waterproof fabrics, so, unfortunately, it won't suit your canvas Oztent.

G'day Steven,

I've looked at our supplier's price list and we can get the Nikwax Tent and Gear Solarproof in the small 150ml sachets. Shoot us an email at service@snowys.com.au if you're keen for us to track some down for you. 

G'day Steven,

Looking at our supplier's price list it would appear we can only get the Nikwax Tent and Gear Solarproof in the 500ml bottles or 150ml sachets. 

G'day Heather,

I've done a bit of reading and Nikwax says that 50ml will cover 1 square meter, so a 500ml bottle of Nikwax Tent and Gear Proof should be enough to cover 10 square meters.