I use Thompsons waterseal for all my stuff, I got a 25 ltr drum of the stuff for next to nothing a few years ago, it does smell a bit until all the solvent evaporates but it does a good job. My 10 year old brotel and my Aldi brolley are both totally waterproof.
Hi Adrian,
I have used Thomsons in the past myself, and yes you are right, it does do a fine job of proofing fabrics. If you wish to re-proof the type of items you used it for, then it will do the job.
However, it should be mentioned that it seals the fabric completely, and thereby also renders it
completely non breathable. For brollies, brotels and the like, this doesn't really matter too much, but it is best not to use Thomsons on more enclosed type bivvies, especially not if they are likely to be used in colder weather. You will end up with a nightmare condensation problem, getting soked by a constant rain of drips...been there, done that


Also....whatever you do, do NOT use it on clothing...you will end up getting soaked again, despite not a drop of rain getting through...you will be stewed in your own sweat

, because as before, the fabric can no longer breathe.
It should also be noted that it does add quite significantly to the weight of bivvies with large spreads of material to cover.
Cheers, Dave.