Leaking windows Grr Grr Grr

Update.
Resealed the window using the correct primer and 295UV.
My master stroke was to mask the inside of the window and the outside of the fibreglass.
This meant I put the primer on only where it was needed and not where I would see it.
Also where sealant squirted out it would go on the masking tape so I could get it off.
Anyway it's watertight so so far so good.
The primer sticks like **** to a blanket and I think it is this that makes a big difference.
I could see on removal areas where the 291 had not adhered at all.
Thanks to all who gave advice
 
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