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I'm more of the fit and forget and top up every few months.
I've found dry out rates are very dependent on sealnt. Stan's tends to stay liquid longer than the mariposa stuff. However the mariposa has been very good for sealing.
I'd probably not recommend scraping as I've found you end up scraping out stuff that was sealing a hole.
I carry a caprisun like sachet of the mariposa sealant and a dynaplug in my carradice for anything nasty.
I d0. Have been doing so for about a year and a half.
30mm G-one speeds and 28mm Pro-ones
I've been very happy with it. Had punctures that have been sealed on both sets.
Probably ~8000km of audaxing so far like this.