i heard that sponge has soft ,medium soft, medium and etc type of hardness
and 1.00mm to 2.2 mm thickness
what does these things all mean, whats the difference if i use a hard sponge instead of a soft one, or what if i use a 1.00 mm sponge or 2.2mm, what is the effect?
if you can present a chart about it i would really love it :D
thx coach :D
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