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Old 03-29-2009, 03:38 AM
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Default Acrylic Render question

Has anyone used prepackaged acrylic render as their final coat? I am tossing up using this instead of making up my own bagging or cement stucco mix.

I used this same material for my base, but am not sure of the heat rating although it wont get too hot as I have 3" of ceramic fibre blanket & 3" vermiculite

I was thinking the acrylic would give me a more flexible final layer

Regards,

Phil
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Old 03-29-2009, 07:32 AM
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Default Re: Acrylic Render question

Quote:
I have 3" of ceramic fibre blanket & 3" vermiculite
The outside of your oven shouldn't get much more than warm to the touch with that much insulation except right around your opening.
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Old 03-29-2009, 07:32 AM
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Default Re: Acrylic Render question

Phil,

Thats the route I went - I used a product made by Dryvit. Survived one winter here with no problems.

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Old 03-29-2009, 03:19 PM
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Default Re: Acrylic Render question

Final coat , with the acrylic render, with colour added should be fine.
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Old 03-30-2009, 03:27 AM
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Default Re: Acrylic Render question

Thanks Johnny, others. I'm in Melbourne too, preparing for the final coat. I've seen Australian Builders (or something similar) brand acrylic render mix and colour. Do you know of it? I'm planning on a couple of coats to wrap things up. Does it need waterproofer too?

cheers. Chris.
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Old 03-30-2009, 05:37 AM
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Default Re: Acrylic Render question

Many thanks,

I thought it would be ok with some tinted acrylic, I just checked the outer vermiculite layer as it is drying and it is setting fine after 1 day, I should be able to render it next weekend and finally start the curing process, low & slow

Regards,

Phil
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Old 03-30-2009, 04:03 PM
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Default Re: Acrylic Render question

Phil, DONT render and then dry. Dry it out first. If you render, it becomes waterproof, therefore you cant push the moisture through the render. Fire it FIRST thoroughly several times until it is dry, use it a couple of times then render.
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Old 03-30-2009, 06:31 PM
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Default Re: Acrylic Render question

Totally agree about firing before render. I use a 4:1:1 sand, cement, lime render first. Wrap for a week to keep it moist and make it stronger. Then start your cooking firings, do at least four good cooking firings before the final acrylic render. I find it best to apply by watering it down and paint it on in a number of layers- great finish. The stuff is waterproof, that's why you must make sure that the moisture is out of the oven before applying it otherwise you are locking the moisture in. A hand held to the outside of the oven should tell you if there's moisture in it. It will be hot to the touch if there's moisture there.
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Old 03-31-2009, 01:32 AM
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Peasant
 
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Default Re: Acrylic Render question

Good point, I was wondering about that.

I know I would have done that with a brick job and was going to double check anyway with the castable so thanks for the heads up

I plan to light some low slow fires for a week or two and you say to ark up a couple of big ones also before rendering

Regards,

Phil
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Old 03-31-2009, 03:04 PM
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Default Re: Acrylic Render question

Heat Beads are a good way to spread the heat evenly over the entire area of the base of the oven, and are a very manageable source.
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