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I used Raggtop as recommended by others on this Forum.
It is 2-step process. You first apply the cleaner, then the sealer spray.
It comes with a brush for the cleaming step.
Rated to last about a year. Obviously that depends how often you wash the top.
Very easy.
I did use masking tape and drop cloths to protect glass and paint while spraying the sealer.
You might also get a tacky roller brush for removing any stray hair, fluff or other micro debris.
I’ve used both Raggtop and 303. Like both. This time I used 303 but rather than spraying it I poured it into a container and used a staining spong and paint brush to apply it. Much better coverage and I didn't have to drape off the whole car. Took 20 minutes.
Used Raggtop and the two step process, taping everything off to spray. It's the only thing I've ever used on all my convertibles but everyone that installs/services convertible tops that I've ever asked endorsed it, so I keep using it.
I do really like Mbourne's idea of pouring it into a sponge, though. If the Raggtop wasn't aerosol I would try that.