Are all, or most, silicone sealants that come in a gun Room Temperature Vulcanised (RTV)? If it smells strongly of acetic acid, is that an RTV type? I'm after an RTV type but not sure if the ordinary stuff is that.

No there is multiple types my Dad used to sell them. Rtv types mix two chemicals together with a special gun and nozzle.

 

http://siliconesolutions.com/adhesives-sealants/2-part-products.html

Pretty sure I know that "acetic acid" smell you are talking about. I think it is is the cheap silicon stuff that is not waterproof or paintable.

 

I have worked in the past with pickling onions and hate that sweet ,sickly smell(esp with onions).

The intended application is to mix it with white spirit to make waterproofing solution. I bought some Diall clear GP silicone sealant - mixed it at the rate of 5g sealant to 50ml white spirit - and it waterproofed a garment fine until it was washed in non-biological washing powder at 30C. I know the commercial waterproofers allow washing up to 3 times before re-application is required.

 

With the stuff washing out first time I'm wondering if there is a more resistant silicone I can use suitable for this purpose.

 

This is just an experiment to see if I can make a useful fabric waterproofer cheaper than the commercial stuff..

Yeah the acetic smell comes from the cheap compound they are using to cure the silcon the more expensive versions(catalysts) don't smell.

Yeah the acetic smell comes from the cheap compound they are using to cure the silcon the more expensive versions(catalysts) don't smell.

Yeah, I've read there is non-smelly neutral cure but I don't know if it's any better for my purpose.