Yes. It's called "paint." :-)

Knowsnothing, if I may ask, what kind of cost did you run into when replacing your floor joists. Is that something you did yourself?

Thanks,

Valerie

If these joists are already excessively wet, paint won't do a thing to stop or prevent rotting buy in spite of his witty repartee, Lawrance had the basic idea right. You have to control the moisture and stop it from getting to the wood. You can buy chemical preservative agents that will slow or prevent rot but these are or can be dangerous to some degree inside of a home.
If you have moisture conditions bad enough to make you worry about further rot, then you have other problems with yoru house.

Where is the water coming from? Let's try to control that.