I decided to seal the edge where the plastic domes touch the bodywork with some kind of rubber
seal, in the hope that it would prevent 90% of water ingress. I thought about various options from P
seal, flat seal, to finally deciding on E profile seal since this had tiny raised sections that would
compress easier than the P section.
I had to trim more off the edges of the domes all around so that it still covered the light aperture but
left a gap all around that the stainless bezel and edge seal would fill.
Once I had trimmed enough off, I placed the domes back on, and marked where the edge was, then
removed them and stuck the seal on all around so that the very edge of the dome would sit within
the width of the E seal.
I then felt I should add extra seal around the brackets where I had paired back the Perspex a little
too enthusiastically.
Once all the seal was in place, I finally refitted the domes and the stainless bezels with their
translucent edge seal and got it all as snug as I could.
I am very pleased with the result – these bezels are much better than the plastic ones and the car
deserves to have them! I also think the translucent edge seal is far better than the black edge seal
(unless your car is also black).