Lime is a good durable low cost paint. Its breathable, alkaline, durable and about £6 per quarter tonne.
http://wiki.diyfaq.org.uk/index.php?title=Paint#Limewash
NT
--- In papercreters@yahoogroups.com, "eogreensticks" <eogreensticks@...> wrote:
>
> i have been doing some experimental concrete work for which the finish coat is papercrete and so far it looks promising-
>
> the base <bones> is made to any shape using cloth dipped in portland cement slurry (with bondcrete in)-the cloth can be old clothes cut to flat pieces if you want to be fancy (natural fibre best)
>
> the cloth is dipped and wrung out then hung on horizontal wires about 6 inches apart attached to wooden uprights (can use ringlock fencing!) Once the cloth has hardened up enough to carry on,a layer of 'sawcrete' goes over the bones (i use 3 sawdust-3 sand-1/2 lime putty-1/2 clay slip-1 portland by volume then 200 ml bondcrete stirred in)
> i paint the surface with porland slurry before putting the sawcrete on...
>
> once that's hardened up enough,the finish coat of Papercrete, again painting the surface first with porland slurry (2 paper pulp-3 sand-1/2 lime putty-1/2 clay slip-1 cement by volume then 200 ml bondcrete stirred in)This 'render coat' can be made very smooth and beautiful with lots of patting!The sculptural possibilities are intriguing and so far the basic structure is solid- my questions are:
>
> How long to wait before painting the papercrete:
> -Does it want a 28 day cure like portland does?
> -Would it be better to paint while the papercrete render is still curing so the paint surface bonds with the papercrete?
>
> -Does anyone have a good recipe for a breathable homemade paint for the papercrete? I have tried Grout mixed to paint consistency with a little bit of bondcrete and lime putty- it worked but the grout is a bit pricey.
>
> -Has anyone tried using Magnesium Cement with papercrete or sawcrete?
> i understand it is keen to form a bipolar bond with cellulose which portland apparently is not...?
>
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