Well done dude.
As a bit of a tip from someone that's done two of these now and learnt from his mistakes first time round...
Make sure the bottom of the seal channel is properly clean from crap/any previous rust particles (that bit I did fine).
Squeeze the PU sealant right into the very bottom of the seal (that's the bit that matters most) and DON'T PUT TOO MUCH IN!
You'll be amazed how far it spreads out otherwise, because of how tight the gap is between the seal and panel.
First one I did, I spent ages running round frantically scraping off bits of sealant before they dried, stuck fast to the fresh paint, as it continued to ooze out
