" All right coming up plaster job in an old house like this one often will involve patching as well as new work -- Chris Rock is here from USG to explain a little bit about the process. What are we what are we doing in this room we've taken out of doors we got a big -- We've insulated to we've got a lot of small holes that have been patched and we've got new walls like this that are just new blue board. So actually what we do is put some imperial gypsum base. Up threw me out existing door for him. Fill that -- we've done is we've patched the existing. -- We've put fiber tape over. It's a pressure sensitive. Existing surface so what is this pink stuff that type of binding agent in USG plaster binder think we make pink and clear yet. What happens as you put the base coat over that. It would re wet and remarks suffice and a plaster has -- adhesion openings are not so what they're ready to start doing now involves this coat kept -- OK now how do you deal with where the wall meets the ceiling up there don't have to worry about cracks. Renders weren't apply the out. -- sensitive tape sort of thing existed -- the -- exactly up to the existing surface. And he batted in while he's applying in the out. -- Okay. All right so Chris explain. Just what's happening here is where we're putting a second coat on now right yes. Basically first coat does you. What a nice scratch coat and get a nice even coat second coat come back over which you don't have to. For the first of describe you know you don't wait for the first one war the second coat first coat to be fully what. Applying a second coat just to take out some of the bad. Dips dives. We're -- take a trowel marks and you can nice smooth finish and then that's it for today but in the next day. The next thing you put your finish coat over what happens is right for the sets it has about an hour set time. -- reports that Bob they're going to take a brush and put -- keep it. So the finish coat adheres to it. Structurally sound went OK and then what about sections where the insulator. Drove all their home. What you do is you use the question -- thank you -- put the box there around the inside of the hole in his ability and with the base coat. And we've done is we've meshed over the top of that structures here. Bond over the whole -- Uganda over the altar yes it. OK now on the this partition this wall where it's all new blue board it's different type of installation. Write its a one coat application what they're liner in this. This procedure here. Basically which -- doing here he's applying one coat over the joints. Reinforce them. And now. Fill in the up regulation that's left from the -- and it currently on exactly prompted them -- butt joint. Exactly. Now does this have to set up before you can actually put the plaster coat on the whole wall that'll set up approximately an hour and and it's ready for -- finish coat. To -- Embedded over the top."