I've used dry pads to sand down floorboards. I bought these from Victor Central.
They were really helpful so worth contacting.
Email trevor Preece on the following: -
info@victorcentral.co.ukPrices I have will be out of date but they sell 60grit, 80grit, 100grit, 120grit and 150grit. Website prices will be heavily discounted for trade.