[general folklore] Does Lawry's Seasoned Salt possess all of the magical repellent properties of regular salt?

Well, it kinda depends on what use you're going for.

Salt is known to repel certain unholy creatures because of its pure connection to the earth (similar to how cold-worked iron does). The issue with seasoned salt is that it's not pure. if you were protecting yourself from, say, a ghost, then you'd want your salt ring to be a continuous line of salt. With seasoned salt you're just not going to be able to get a continuous line (unless you removed the seasoning somehow, but you indicated you are pressed for time and that doesn't strike me as a fast activity). It might provide a slight challenge to a ghost trying to cross a seasoned salt line, but they'll still be able to cross it.

Now, for other unholy creatures (vampires and certain fey, specifically) salt's properties are irrelevant, and it's just the fact that salt comes in a bunch of discreet grains. These creatures are compelled to count objects, so throwing even a tablespoon of salt can occupy one for hours. Historically, some people prefer to use rice or other food grains for this application because it tends to be above the size threshold for needing to be counted (these beings don't, for example feel compelled to count very fine dust), but kosher or rock salt is a safe bet too (and you don't need to carry both salt and rice, making it easier for the hunter on the go). I'm not super familiar with this particular seasoned salt, so I can't speak to whether it would be useful for this application, but if the grain structure of the salt was large enough it could work.

Remember that Demons are basically lawyers so if you need to repel those it won't work on demons affilated With the McCormick & Company inc.