Painting over render

19 Mar 2007
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United Kingdom

i have to re-render some of my exterior wall with high build. Some of it is flaky and i can rub, stabilise, and high build ok, however theres uneven bits i want to put high build on that has sound smooth render on it.

my question is - on the sound parts of the wall do i need to key it somehow before applying stabilising solution?

or should i just put the high build directly on?

or just put the stabilising solution on top of the smooth render then apply thehigh build

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Ok I'll ask the question this way.

Q. Is it ok to put stabiliser onto sound smooth painted surfeces before applying highbuild, or should i agressively key it?
Stabiliser wont act as a key. Stabiliser should only be used when the substrate remains dusty after prep. I've used highbuild strait ontop of sound smooth masonry paints without keying and no problem. (it sticks like **** ;)
If you use stabiliser onto a sound surface,it will make the wall toooo glossy, then when you apply paint/highbuild, I think you will be dissapointed to see it flaking/ peeling off whithin 12/18 months. I would touch in the dusty area's only with stabiliser.

Hope this helps
John ..
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