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I wouldn't have throught it would make much difference .

atb

Wizard

I don't think doing it in two halves would make a difference. When you come to do the next section, make sure the mastic tape is squeezed into/under the end of the section you did first (if that makes sense) to ensure there is not a gap, the mastic tape will stick to itself and seal it to stop water getting in.

I learnt this when I resealed my rails, I left about a 1mm gap between rear and front rails, some water got in and ran down to the window.

After a bit of investigation, I added some more mastic tape into the gap (after some losening of the re-sealed rails  ) then tightened up. No more water getting in.

Good luck

cleaned the rails and front rail too also scrubbed and scraped off mastic and silicone on van am pooped!!!!!!!!!!! got a silicone remover tool really helped and white spirit and brillo cut through it fairly well.

ready for hubby to do the above tomorrow

he seemed to have easier job than me heres his tips:

buy new screws corresct size

need spare pair of hands

getting first screw in hole tricky but once 2 in your on your way.

sealant on holes and along two rims of rail used sure seal