In number 2. instructions above. after you use brush to put in spots and go back in to shading mode to look at results.... if you are haveing trouble seeing the shine. hit your 'lights' in the menu in upper right side then hit light bulb icon and adjust light strength.
Also adjust strength of shine in your normal map node. gabe said he had his at .7
but mine was turned up to .700
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The below instructions are basically garbage for making bump map (normal map). but you can use it for roughness map
Hit the duplicate layer button in layers
Hit the eye on original layer so only your new duplicate layer is visible
Then go to colors and hit desaturate then select desaturate and set mode to lightness hsl
You can use the image the way it is but if you want to have a rougher image just make the darks darker and the lights lighter with contrast and brightness adjustments
Name your layer bump then go to export as and save as png
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