Ken
I've always had good results with Seal-A-Cell, and Arm-R-Seal. Flood coat with the Seal-A-Cell, and wipe off excess. Let dry and follow up with Arm-R-Seal in the gloss level finish you like. It's a pretty easy finish to get good results with.
Rubio Monocoat with the Ceramic additive does look really nice in the internet vid's I've seen, but I've never used it.
I've just started playing around with the hard wax finishes, and I'm still on the fence. I've only used Odie's so far, and it is not easy to apply correctly,per their instructions.It's a workout on a large piece.
Here is a cutting board done with Odie's ;
https://sawmillcreek.org/showthread....ard-Old-Design
Here is an air dried walnut top 22"x60" done with Seal-A_Cell, and Arm-R-Seal.;
https://sawmillcreek.org/showthread....aft&highlight=
BTW
The Seal-A-Cell and Arm-R-Seal used on that sewing machine top were probably 8-10 years old, and previously opened. I pretty much used them on that top to get rid of them.