Do not use in contact with the edge sealant of double glazed units.

Any ideas on what I should be using.

Wow. All the low modulus sealants I found were neutral cure and suitable for
double glazing. I needed a lot in a hurry, so got to see all the brands from
all the shops/BMs. Mostly they were described as "frame sealant", with
"glazing sealant" available for twice the price with no discernible
difference in suitability for different applications, both being described
as suitable for the installation of double glazing.

Christian.