Got my chrome U trim today. Its not flexible at all along its length so I couldn't wrap it round the edges like rubber trim so I had to come up with another idea.
It comes in a coil wrapped sideways so I decided to trim one side off so that it was more like a J section that a U section. To do that nicely with an even cut all the way along I made a little jig out of some scrap MDF.
The profile was cut/filed into the MDF so that when put together the trim could pull through it. I used a piece of breakaway blade in the middle and clamped it all in a vice. Pull the trim through and voila, perfectly straight cut for the full length.