rado it has a tiny bit of give in it when dry
@Porkchop I use U-Pol Grey Stripe brushable seam sealer. I first used it on my yellow 244 to seal up the gutter seams after repairing them, that was 12 years ago and it hasn't deteriorated at all!
It's not quite the same as the chewing gum like sealer the factory used, but it brushes on with a similar texture, and it's designed to be painted over so it looks pretty factory when all is said and done.