Waterproof Bike Jacket

If I buy a box of wax for sealing garments will it work on a hitherto non-waxed cotton jacket, and if so, nobody knows what to do?

Thank you

Forget everything spraying - Get the Nikwax. It really works and process all of your jacket and you do it yourself. Google it you will not be disappointed.

spray Scotchgard on a box / seal

Get a can of Scotch Guard. Is the best.

Yes, you can ... If you use the material for re-sealing tents camping supply stores ...

Just follow the instructions on the box (you may need two coats, my old man Belstaff)

You can send jacket makers and they wax for you

havent heard of anyone who, in a long time.
yeah it will allow more wind and waterproof but the cold goes right through it, so make sure its big enough to wear something warm underneath.

I just bought stuff called Millette Sabsil again waterproof cover my boat - should be worth a try.