How to waterproof a dry-clean only polyester raincoat?

[ilovemyoboe]

Have a four seasons 100% polyester raincoat that is in need of an urgent clean and reproof. Got soaked today! No idea how to do it though. Do dry cleaners reproof? Is there a cheaper way of doing it at home? Have seen spray-on waterproofing stuff e.g. Nikwax, but that seems to be for tents and outdoor gear rather than a plain raincoat. Any ideas anyone?

Nikwax does a clothes one too but you really need their wash-in one to get it to last.
If you don't have a tumble dryer however, I'd recommend the Grangers cleaner and re-proofing sprays over the Nikwax one. link here to spray

Thanks for your reply MoonlightandRoses. Why did you mention having a tumble dryer? We do have one. Does that change things? I know I can use something like Dr Beckmann to 'clean' the coat in the tumble dryer, but is there a way I can reproof it in there too?

Can't actually understand why something that is 100% polyester is Dry-clean only anyhow .. but not sure if I want to risk washing it. But then, if it's not waterproof it's not much use, so maybe I don't have anything to lose!

I have used scotch guard waterproofing on raincoats after washing them

www.paintsprays.co.uk/catalog/product_info.php?products_id=61

It's because for the wash in proofer, you need to chuck the garment into the drier afterwards for it to fully take effect.

Seems practically everything is 'dry-clean only' nowadays - I have a feeling it may be to ward off any shrinkage complaints / returns. A 30 degree wash and then the cooler dryer setting should be fine with polyester though.