I'm planning to lay some cheap ish vinyl wood effect plank things on top of tongue and groove, which is in pretty poor condition. This is a temporary solution, to stop imminently crawling dd getting splinters - we plan to get a nice floor at some point. Although round here temporary solutions have a habit of lasting longer than we had planned.
My question: do I really need to seal the floorboards with PVA? Or can I just lightly sand, damp dust, and leave to dry?
Spindelina, your floorboards look like mine - mine flex too, but I barely notice this now as they covered by the vinyl. I did not lay any plywood or anything under the vinyl. It is just floorboards and thick felt-backed vinyl. My kitchen/diner is also big, about 4.5m x 4m. I fitted it myself (I am a women) within about 4-5 hours, while my family was asleep. It was heavy roll and not easy but I did it. I will try to find the link on ebay for you.
Here it is: [[http://www.ebay.co.uk/itm/Dark-Natural-Oak-Wood-Vinyl-Flooring-FELTBACK-LINO-4m-/190446776632?pt=UK_Flooring&var=490016537784&hash=item2c57833138 this] It say sit can be laid on uneven surfaces. Just make sure there are no nails sticking out.