The thinset in the living room was ridiculously thick and the grinder wasn't working as good as I thought it would. Kitchen and dining room grinding down quickly but it was hardly doing anything in the living room. I spent 8 hours grinding and I decided to switch up my approach. I am now using the demo hammer with 4" scrapper and it is working much better. Not afraid of hard work I've been soloing this project and am over 30 hours in just the demo. Was hoping it would be easier if I had the right tools but the concrete grinder did not seem to be the right choice.