Hi,i have just picked up my new US Army bivi and was wondering if i needed any special gear to reproof it,i use Nikwax Tech Wash+ Wash in on my old UK bivi and Goretex gear,i don't want to screw up my nice new toy if it is not compatable,need to reproof it as i am off on Dartmoor at the weekend so not too sure how it will be without a treatment.