My table saw has a Alum. top...I've had for about 20 years....Still does not leave marks, why? you ask? I keep it clean and apply a coat of Good old Johnson's paste wax as I do my work bench, my router table and anything that provides a sliding surface. There are a lot of alum plates out there provided by very reputable mfgs... It's like every tool you use..proper maintenance and care...common sense..
Just my thoughts and experience.
It's good to know I'm not the only one who does this too.
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