So had a look yesterday on how it turned out with the first layer of epoxy. The colour seemed to stay as I wanted it:)
I think I used a bit to little epoxy on some areas, and some of the black caulk didn’t get covered totally. Next step will be to sand it with a fine sandpaper, clean it off and put on a nother layer. I think I’ll do the other theee caulk lines after that and 1-2 more epoxy coatings befor the varnish test on top of it all. To early to say how it will turn out but the hope is still there after this first test.