I have installed a new bathroom and want to floor it with self-adhesive
vinyl tile. The floor is oak but messed up (the house was built in 1954 and
had carpet at one one time and little "shimmies" put in instead of solid oak
throughtout, etc., so no, it won't look good leaving it bare).

Do I need to put a sub-floor under it first, or should I just stain it first
and then put the self-adhesive tile down, or...?

Thanks.