Yep, dry lube for slide out mechanisms and jacks. Silicone spray for hinges. Regular WD40 is always good to have also.
As far as the slide out seals themselves, I have owned 5 RVs with slides. Never lubricated or conditioned the seals with anything. And we live in the Southwest with all the sun and heat. Never had any problems.
But some folks condition them religiously. Do what makes sense to you
Scott and Liz - Southern NM
2012 Wildcat Sterling 32RL - w/level up (best option ever)
2007 Chevy 2500HD 4dr short bed Duramax w/allison
Reese Fifth Airborne air ride king pin coupler with Sidewinder