Patching plaster

[MidsTW]

I removed 2 sections of wall to allow me to move pipes into the stud wall. I am now putting everything back together. The skirting board is back on and filled, I replaced lath with plasterboard and filled some deep sections. I now need to plaster to finish off. I have done some before but the depth require here is about 5-6mm.... I have Gyproc Multi Finish.

Should I add some builders sand to the first coat to make a sort of Browning coat before the final coat?

Pic of the area below:

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[Dextraneous]

If it were me, I'd pva the area and just double skim it.

 

[MidsTW]

Just brush diluted pva on the area and then double skim with the multi finish?

 

[roughcaster]

Give it a damp down/pva, especially around the edges, then bring it out more or less flush with Bonding Coat. Let it set/go off,THEN use multi finish to finish it off.

 

[MidsTW]

Damn I haven't got any bonding ...

 

[roy c]

B&Q are open tomorrow so why don't you see if you can buy a damaged bag off them .....

 

[Dextraneous]

Give it a damp down/pva, especially around the edges, then bring it out more or less flush with Bonding Coat. Let it set/go off,THEN use multi finish to finish it off.

5 to 6 mm. Is it really necessary?

 

[roughcaster]

A far better job in the long run.Bring out with bonding, then multi.

 

[MidsTW]

Sorry guys didn't see the last 3 comments. I went for it in the end without the bonding (sorry) I just thought I would go for it with it being a small area and the fact we are pampering.

I have done the first coat, however I think it still might be too deep for a finish coat. Do you think I should do another skim and then a finish skim?

I am going to leave it for a couple of hours to stiffen up anyway.

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[roughcaster]

You're making a tidy enough job of it that's for sure. Although it didn't look very deep, it's deeper than what you think, and one coat of Bonding would have bulked that patch out in one go, ready for the multii finish, it's what it made for. Anyway, it's done now and as you say, it needs to come out a little further. Put another thick coat of multi on, but this time, bring it out more or less flush, and don't scratch it. Keep the surface neat and tidy, and even put a "small" straight edge acrooss the patch, just to let you see how much more it needs to come out to flush.As long as it's kept back about 1mm or so, that'll be perfect. Let it set/go off, then put on your last thin coat of multi to finish it off.
For any future small patches that are around 6mm 7mm or so, i'd always recommend bringing them out to 99% flush, then finish them off with multi. As Roy says, sometimes you can get a damaged bag of plaster cheaply, and even if you wont need it all at once, put it into a polythene bag, keep it in a nice dry space, and it'll keep for long enough,,, ideal for small plaster patching work.

 

[MidsTW]

Cheers for the help roughtcaster.

The coat I did earlier is firm now so I will put another coat bringing it almost flush. How long should I wait before the finish coat? An hour or so?

 

[roughcaster]

I'd let it go right off. If you put the last (finishing coat) onto the previous thicker coat too early, you'll end up with a load of blisters. So let it go right off, then put on the thin skim finish. If it gets too late, do it tomorrow, or whenever. If you do run out of time and decide to finish it another another day, just give the patch a damp down/ coat of pva to klll any suction, pva again, then skim onto it while it's still tacky.

 

[MidsTW]

Ahh yes I understand - Brill!

I have just put on the 2nd to last coat on, about 1-2mm underflush.

Struggled to get it underflush at the edges though.

You reckon it will have gone off by 8pm or should I wait until tomorrow? Never done real wet plastering before

View media item 91512

 

[roughcaster]

It will definitely have gone off long before 8pm. If you feel confident you can finish it today then fair enough, but if not, do it tomorrow. It's looking good anyway, and you'll learn from that.

 

[MidsTW]

Should hopefully have it done today then. Should my finish coat mix be slightly wetter than before? Thanks again!