What adhesive is advised to bond rigid solar panel corner mounts/cable gland to roof.

i used stixall ,using matches to give a 2mm thickness ,then added one of these to each bracket ,tightened a bit them smeared the heads with more mastic https://www.screwfix.com/p/easydriv...PYnp21CST36OOKTswuMaAnC5EALw_wcB&gclsrc=aw.ds
The problem is Nigel, the length of the screw and what type of roof, it is glass fibre then the screws are no good and if there is next to no insulation before the trim the length of the screw is so vitally important as I wrote in my earlier response.
 
I fitted new panel today, Thanks for all your advice, In the end I used Sikaflex 552 plus stainless screws on each bracket.
Finishing the wiring in the morning.
 

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