>> does the 2nd remove the 1st or does it actually "build" up ?
SRP builds up, it's a relatively low cut polish but also contains filler, which through several layers will fill marring etc.
On it's own the filler should last a few weeks, but since you've done all that hard work, and because it's nowhere near as intensive to apply, it might be worth putting on some AutoGlym Extra Gloss Protection (literally wipe on, leave for an hour or 2, buff off) over the top. It's an extremely tough sealant, one of the better ones i've used.
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