I use the Magna Tech and haven`t noticed any marring either. I use two buckets: one with soapy water to apply and a 2nd bucket of plain water to rinse the sponge.As I said, I used it on light metallic, so marring was not easy to see(if there was any). Garry is a very reliable source, so, if he didn`t notice any marring on black, that`s good enough for me. I think you all will be amazed how much more efficient and easy the block is compared to clay. I am!
I also use absolutely no pressure on the sponge; just hold it lightly and keep moving it back and forth until I get that "smooth" feeling. Purchased at ADS also.
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