On Sunday, February 17, 2019 at 8:39:04 PM UTC-6, DerbyDad03 wrote:

I did sand the bottom of the feet. I was considering adhering those plastic
sliders before I deliver it. She has an area rug in the dining room.

Be careful what you buy, sliders or the stickum casters!! The sliders don't have the adhesive stickum. Sliders are used just for sliding/moving furniture. You don't want the sliders. I've mistakenly bought the sliders, when I wanted the felt or vinyl stickum casters. The packaging for each look very much alike, so it's easy to mistakenly pick up the wrong item.

On almost all the furniture I upholstery, I replace these stickum casters, because of adhesion issues. Sand the old surface and apply a reasonable sealer, for better/best caster adhesion. The customers appreciate the extra little effort.

Maybe
I should apply a few coats of wipe-on poly to seal the end grain before
attaching the sliders. Thoughts?

It's preventative maintenance, of sorts, and easy to do, especially if you have some quick-dry poly handy.

Sonny