I have been using Fastrack for at least 10 years and haven’t broken any. So far, at least, I haven’t encountered zinc past, either. You do need to be gentle when separating Fastrack pieces. I use a small pocket knife and a smallish flat blade screwdriver. Use the knife to begin separating the sections then insert the screwdriver into the separation between the center and outer rail; just a twist and they pop apart.
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