I have a detached two stall garage that is probably about 30 years old. It has a wide long crack running lengthwise a near the middle but more towards one side from the others. The slab is sinking on that side pretty badly. I don't think mud jacking is an option, plus I want to do it myself to keep costs down. I was thinking of maybe cutting some cylindrical holes 1-2' in diameter into the existing floor along the sinking wall and then pouring some new concrete. Then when it is set, putting some floor jack posts on these pads and running a beam overhead. I'm thinking that could stop the sinking and stabilize it. Then cut out and replace some of the bad sections of the floor. On the other hand, I'm thinking maybe I could temporarily stabilize the sinking side some other way, cut out the bad sections of the concrete including the foundation under that wall, compact the soil and then re-pour that half of the floor. It would be about the same amount of work, I'm just not sure how to go about stabilizing. It could take a little time if I do it myself, plus, sometimes other things come up and projects get delayed. Any thoughts?

I have a fire pit that I would like to stain/paint if possible. It appears to be made out of fiber concrete, and is currently light grey. It isn't sealed, and people tend to set drinks on it and leave rings. I plan on sealing it, but before I did I was curious if it was possible to change the color. I haven't been able to find out much information online about it. I would really enjoy the faux granite look, however I'm not sure how well that holds up to indirect heat. I would also like a thick glossy countertop finish on it, but I am also not sure if that can withstand temperatures as well. Any help would be appreciated!