I've had to put a new wooden door on the garage. What's the best way of treating this? Normally I'd wait for a dry summer day and varnish it but can I use varnish when it's freezing like this? Luckily it's in a sheltered spot which doesn't get much rain so it'll stay mostly dry over winter but I'd still like to treat it asap. Given the choice I wouldn't have done it now but since the old one broke we had to get a new one put in.
Thanks