Arm-R-Seal over Zinsser Amber (NOT dewaxed)?

You won’t have a problem putting it on, but it may come off over time. The general warning is that anything with urethane or polyurethane resins may have trouble adhering to waxy shellac (and a lot of other stuff). You wouldn’t be able to topcoat it with seal coat before the Arm R seal either, the sealcoat will dissolve into the amber and some wax may come to the surface. But there’s also a possibility you won’t have any problems, although it’s a gamble IMHO. If you want to go with the amber shellac, I’d choose a non-poly varnish for the top coat such as P&L 38.

-- I long for the days when Coke was a cola, and a joint was a bad place to be (Merle Haggard)

Pretty much nothing adheres well to wax. This includes shellac with wax.

You can get dewaxed amber shellac. But it will be in flake form and will need to mixed with alcohol (not a difficult thing to do). The other finish should adhere just fine to dewaxed shellac.

Skip the shellac; it’s superfluous.

-- Clint Searl.............We deserve what we tolerate

Use Seal a Cell for under coat for Arm R Seal.

-- Bondo Gaposis