Don, the guy that does glass etching and I do think other points, has reported that it depends upon the how thick the "pores and skin" is and the sort of and depth from the etching.You could "scratch the surface area", however the further the more of the change the https://bathroomglassshowerdoors48146.loginblogin.com/41783670/the-2-minute-rule-for-bath-glass-shower-doors