Crushed Glass Grit vs Coal Slag

ContractorTalk.com is a great resource for contractors looking for help from their peers on a variety of topics. There was recently a thread started by a contractor that uses coal slag who was looking for other user's preferences as well as similarities and differences between Crushed Glass Grit and coal slag. Some of the comments included:

"I use the glass because of the area I am in...Maine is going greener..."
"I use coarse glass on heavy rust and heavy equipment"
"'Medium grade good for autos and bikes"
"Glass cleans faster...large media for heavy scale and rust...fine for everything from log and cedar homes to thin sheet metal auto panels"
"My {powder} coaters like glass because it is clean and takes very little prep work before coating"
"I used to use slag and it's filthy. Even my hands were dirty from being around it."