So I'm about to re-seal my front and rear windsheild gaskets so I don't have 3" of water floating up the floor mats. Has anyone done this before? What I'm worried about is taking out that center bead & then trying to get it back in. Are they brittle? Do they crack? How hard are they to put back in?

TIA for all the help.
_________________
BMW-Yachtsport
'07 Accord DD
'83 e21 - DD (work in progress)
2574356 - sleeping in need of restoration