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I used the adhesive bituminous AMI Instant Roadbed for my N-scale track, and at the switches what I did was I discontinued the AMI. Instead, I super-glued thick cardstock (1/8" thick to match the depth of the AMI) to the underside of the turnout ties, just in the places where I knew I would not want to add ballast. The cardstock is the same basic concrete-gray color as my ballast, so when I add ballast I bring it just up to the edge of the cardstock then stop. At the switch points, there is still a grey color between the ties, but it is not ballast and it will never get into the workings. Of course, the full depth of the ties is visible, but if you look at real switches this is frequently the case anyways. <br /> <br />EDIT: I forgot to mention that I cut the cardstock to match the width of the ties, which allows me to still ballast an outside shoulder against the edge of the cardstock. This must be done carefully, of course.
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