Thrustvector-
Very nice, and duly noted for metal mudguard upgrades! What if anything did you use to mask it?
I think the idea originally came from my reading Tony Oliver's Touring Bikes book a long time ago, but I don't have my copy in the UK to check.
Here is a somewhat detailed summary of what I did to mask it:
I used 35mm wide STUK masking tape cut into short lengths of about 25mm. I applied each strip with the short side halfway inside a section of the inner lip and wrapped them laterally round outside of the mudguard toward the centre line. Each small section butted against the next along the inner lip. The front and rear of the mudguard used narrower strips. Once the inner lip was completely masked I applied 60--80mm lengths longitudinally to the outside of the mudguard until no gaps remained. After a couple of days drying, the excess rubber underseal came away nicely at the edge of the masking tape, carefully removed one lateral strip at a time.
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Nick_S
I decided to reduce potential road noise from grit/spray flying against the Bob Yak trailer's alloy mudguard by applying underseal. Some searching of forums, mainly for motorcycles, suggested 3M rubberised underseal and I bought 3M Car Body Schutz 08877 in aerosol, the type available in Europe. After 4 coats, it had built up a 1mm layer. When dry, I stencilled round the inside fittings and cut out the rubber so that they mounted firmly against the alloy at the attachment points.
I swapped in a B&M Secula Permanent battery-powered light which was a similar size and orientation to the original passive reflector, shortening the upper mounting screw to the same length. It required a small amount of black Sugru to fill in a gap around the slightly narrower lower mounting pin which prevents the unit from twisting off centre. It was rather too easy to turn on so I took out the black button, which has a length of plastic rod that operates the unit's switch. I removed a fraction of a mm off the length of the rod using a sharp blade, before refitting it. A very slight lengthening of the rod, by gently pulling it with some narrow pliers, resulted in the ideal force needed to turn the light on. The Secula offers a wide field of view and it provides helpful sideways illumination for nighttime trailer use.