What's the best way of sticking UPVC trim to UPVC?

 

This is for the mitre joints on a bay window which seems to have developed big gaps between a couple of the frames. 

 

Super glue?

 

Silicone grab and seal?

 

Silicone sealant?

 

Thanks

Mitre bond works but you find movement is breaking the joints you may find it might crack again. Make sure the window is fully secure to the bay posts before you try and fix it. 

4 minutes ago, PeterW said:

Mitre bond works but you find movement is breaking the joints you may find it might crack again. Make sure the window is fully secure to the bay posts before you try and fix it. 

Is Mitre Bond non-destructive, so if I needed to take it off it would come off without damaging?

 

Is Mitre Bond a brand?

 

Mitre Bond is cyanoacrylate and accelerator, so an activated superglue. 
 

It won’t affect the frame but you may damage the trim if it’s thin plastic but no worse than any other glue.