waterproof coating for plastering

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stephen

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Hi there, I'd be grateful for some help. I am an enthusiastic DIY-er and have done some lime rendering in the past which went ok. I'm about to renovate a shower room, and rather than tile it, I want to render it to give a rustic finish. I then will of course need to coat this with something to make it waterproof. Has anyone done this before? I'm wondering whether you can use either an additive in the render, to make it waterproof, or some sort of coating / varnish to put on afterwards.
Thanks for you help,
Stephen
 
Ive done a couple of bathrooms in white cement render looked really nice with down lighters picks up the quartz in the sand
 
church said:
Ive done a couple of bathrooms in white cement render looked really nice with down lighters picks up the quartz in the sand

Thanks so much for this - I would love to use a white cement finish as I love the look of this - but do you just use white cement or do you have to coat it with something afterwards or use an additive? What stops it from simply absorbing all the water. Sorry to be so thick - just that I need to get this right, plus I'm in the middle of rural France so there's noone here to ask! Thanks again.
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I'm not sure if they sealed it with anything i just cant remember sorry , but it was a basic outside render mix 4-1 scratch coat using plastering sand opc and sovereign waterproofer , it was left for about 3 days then topped with with white cement with white soft sand (washed) and waterproofer , it gave you a stone like finish and it was used in wet areas but if it was sealed after application im just not sure hope this helps tho.
 
Use which ever product you wish whether white cement etc and seal with an acrylic clear matt sealer, you could also use a two part urethane sealant but i'm sure these only come in a semi gloss finish, just make sure the surface to be treated is completely dry
 
I remember it was a special sand for the top coat loaded with quartz to reflect light supplied buy the customer , sorry cant help anymore but it looked great well it was done .
 
A lot of showers in Spain in older houses are finished in Capa Fina to give it a rustic finish, Capa Fina means thin coat basicly it is a hand applied OCR and is suppose to be waterproof but ime not sure it is 100% same as OCR especialy in a shower room, if the shower is first floor or more might be better to tank it first same as a tiler would.
Lucius.
 
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