Burn streaks on the work

[krv3000]

hi well as i use one of thees at work see if this will help you we only get the stones of a locale company and they have a chart that covers their range of stones and Wat to use them on as most things at work is ether d2 or gage plat or cast we only have 4 types of stone blue = gage plate black d2 pink cast White forming if you get your stones from one supplier see if they have a chart to cover their stone range and use