Personally, I've given up on screen trim...I think that screens look better without.
Plus the fact that all the trim that I've had has eventually suffered from the outer layer of clear placcy peeling off and the glue going soft so that it won't stay in place.
One thing that I haven't tried though is Maplins stuff. The last time I asked about screen trim on here, a load of people steered me towards Maplin because they have some stuff that's meant to be protective edging for pressed steel equipment boxes and the like. Apparently, it's superb for screen trim and cheap as chips.
Jools
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