Not if you do it right in the first place. However the joy of lime plaster is that even the less than competent can push it around for hours and get it looking half decent.
Its a really good way to start.
Its the cheapest way to do it, but not really recommended. Buy a tub of lime putty from Bleaklow or somewhere similar.
You can dry it out, but you can't get it hot enough to turn the carbonate to oxide.
I think lime industries have a web site, which explains the process quite well.
Well, thanks to all of you for the good information. When I find one of those round tuits I shall definitely give this a go. I have a feeling I might have met my match when it comes to plastering, but I dont want to remain in that state of mind unless its really necessary :)
The materials dearer (once you factor haulage in) and you cant chuck it on like sand & cement. Its a lot dearer in my experience. (Having done both in the course of making a living).
I doubt anyone would be able to tell. There's a lot of ponceing about and mystecism with regard to lime, usually by various bodies with vested interests in pushing their services.
Looks like not every Jewsons is stocking it yet. Right next to the warehouse desk in my local Jewson is stacked a pallette of tubs labelled "Bleaklows Slaked Lime Putty" if I remember rightly
Tell me where you are in the country and I'll see if I can come up with another supplier
Anna
~~ Anna Kettle, Suffolk, England |""""| ~ Plaster conservation and lime plaster repair / ^^ \ // Freehand modelling in lime: overmantels, pargeting etc |____|
This was the Aylesbury Jewson. Do you have any opinion of
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and their products/prices? I was thinking of ordering their DVD and a small amount of material to practice re-rendering a "witchert" mud & straw garden wall.
I can't. This has been mentioned before. Andrew Gabriel mentioned the problem.
Not glazing putty for windows, lime putty for lime mortar etc. You can buy ready-made lime putty, or tip a bag of hydrated lime into water to get the same stuff, to all intents and purposes. I was asking about the price difference.
Question for Anna really, but also anyone else who knows the answer:
What is the "ready mixed" lime mortar you can get from people like Tilcon or RMC and how does it differ chemically from lime putty mortar? I guess it's a mixture of sand and hydrated lime, but can it be used as lime mortar in the same way as lime putty? If not, why not? I'm confused about this as all the suppliers' literature I've seen seems to assume it is going to be mixed with cement on site.
It uses hydraulic lime which is similar to cement - add water and use quickly. Mostly comes from France under St.Austier label I believe. Don't use it myself - only a few miles from the Bleaklow site which sells the authentic English non-hydraulic lime.
Yes that's right, but it's not the product I meant. From people like Tilcon and Readymix Concrete Ltd you can get bulk deliveries of wet lime/sand mortar which can be stored on site almost indefinitely (as long as it's protected from the weather). This is mixed with Portland cement before use for bricklaying - I don't think it will set without the cement, but maybe I'm wrong there. This website shows what I mean:
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don't quite understand the difference between this product and the lime putty mortar you would make using the Bleaklow putty, which sets on its own without cement.
When the cement is added, there is just a normal cement set, with the lime acting as a plasticiser for the mix
But had the cement not been added, yes the ready mix is chemically similar to lime putty mortar - just add water -
As well as this cement ready mix, it is also possible to get two other different sorts of REAL lime ready mixes
Lime putty and sand readymix I use all the time. Comes by the bucket. Take the hard graft out of mixing, just add hair, fluff up and go
The other is hydraulic lime mortar in big hoppers. This generally gets used for newbuild
Anna
I've not heard of either of these brands which make me think that they must be hydraulic lime mortar
Just to confuse everyone, there is hydrated lime which is dried bagged putty lime
And there is hydraulic lime which is lime putty with impurities in notably silicon . Hydraulic lime always comes as a dried powder never as a putty cos one of the effects of the silicon is to make it set underwater.
Another effect is to make it set quicker
Another effect is to make the final plaster harder; a bit more like cement which is a BAD THING
There are weakly hydraulic limes and strongly hydraulic limes ~~ Anna Kettle, Suffolk, England |""""| ~ Plaster conservation and lime plaster repair / ^^ \ // Freehand modelling in lime: overmantels, pargeting etc |____|
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