I've been using this for the last 5 years on my slides, jacks, door hinges, anything that's supposed to move freely with no issues. NEVER use WD 40, it's for rusted bolts only! It has the same Teflon ingredient as the CRC for about a 3rd of the price, I get it at Wal-Mart. The dry stuff I used left a powdery residue behind after it dried.
Just another slide FYI, the factory guys recommended using Pledge furniture polish on all the slide seals & any other seals throughout your rv, dirt doesn't stick to it & smells better than the expensive seal conditioner, I buy the dollar store imitation which works just as well.