Plastering in a conservatory (threads merged)

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I am unable to find Bonding plaster to initially put a coat onto bare brickwork; however I have purchased a bag of thistle undercoat can I use this before using a finishing plaster - I have 5 Lts of SIKACem waterproof PVA can that be used ?
 
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Which wall in the con do you propose to plaster?

why not ask the mods to move you to plastering forum
 
The problem is rusty beading so I am replacing the metal screed with an undercoat ( should I think be bonding but asking if I can use an undercoat and then when it goes off I will use a finishing plaster. This is an outside wall
 
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I need to replace a rusty wire mesh and then use a bonding plaster to set it and then to use a finishing plaster. However I am unable to get a bonding plaster and I have purchased an undercoat plaster - will this do the same job for me. Do I need to seal the area with a PVA Bond before commencement. The area is only at the top of the conservatory on an outer single bricked wall
 
Hi Ted 456. I recreated my question into the plastering forum as you suggested thanks
 
With the limited info provided: why not use a 3:1 or 4:1 sand and lime render mix on that vulnerable wall that's already shown a damp presence in the rusty mesh or metal angle bead?
Use fibre glass 1m sheet/roll mesh if you must and plastic angle bead.
 
don’t plaster a single skin that’s already damp. get the outside rendered or waterproofed first.
i’d post the question in the plasterers forum where you will get a sensible educated reply from tradespeople.
 
i would only use sand and cement in your case. 4:1 with a waterproofer or sbr in the mix.
you can multifinish over that.
i’m not a huge fan of ‘waterproof’ pva . most of them are only actually waterproof when cement is added.
so using them as a waterproof ‘barrier’ wont work unless you make a cement slurry out of it.
when you re-bead the corners you can use galvanised thin coat beads as opposed to the mesh ones .
 
70F65DC2-1D91-4F94-8D1A-8D89A9094237.jpeg 59F6A0D4-8EBF-4FDC-A9AE-C7ACCD948F01.jpeg

Ok I have uploaded 2 files. 1. Of the wire beading to be replaced and of course what plaster and what finishing plaster.
2. This is also a similar situation where I have chipped away to the brickwork and I would appreciate the plaster I would require for that. (This pic is where the plaster had blown over years at the back entrance to the conservatory
 
if you don’t want to use sand /cement , the only bagged backing plaster suitable for that situation is thistle dri coat.
 
Many thanks Benny - so that is a definite - I will have to return the Undercoat plaster, Now do I just use that and then a finishing plaster. Why not bonding - I had a plasterer in may years ago doing an indoor chimney breast and he used a bonding 1st coat then as it went off he used a finishing plaster. Also can you advice do I need anything (as this is inside a conservatory ) do I need a watered down PVA Prior to starting. I do appreciate your help and hope the pics help (hope you did not have to stand on your head to view them) ps at this rate I might have to return all.
 
surely stainless steel angle bead is better than galvanised in a potentially damp position?

he will not need much so cost will be low.
 
surely stainless steel angle bead is better than galvanised in a potentially damp position?

he will not need much so cost will be low.
not come across a stainless SKIM bead. render bead yes. willing to be educated though.
there are plastic available , multifinish tends not to like to stick to it sometimes.
 

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