Clear Sealant for Headlight Lens/Covers

Has anyone had any experience of trying to make a water tight seal on the their front head light lens/covers, but without having to paint a black border under the lens or using foam underneath it? Looking for this effect:
If you want to have it water tight you will have to have some kind of sealing material. If you don't like the black ring try painting it the body color.
I didn't want to paint the lens if possible - looking for some kind of very thinly based clear sealant which you can brush on, just to act as a barrier.


Mike, You might try painting the body area around the cover with clear "self-leveling" RTV. Let it cure before you install the cover or you might not be able to remove it. If you can find a non-stick release agent for RTV you could install the cover and then the RTV will cure and form a nice gasket.
That sounds like a good idea Neil, thanks. I'll investigate on some self-leveling silicone. As you say, I do want to get the cover off again at some point. The seal only needs to be thin. Will try first on some bits not on the car.