Sbr ?

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Monkeysuncle

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Morning all

I’m filling in some channels between old (sound) render, where rotten decorative wood has been removed. I’m gonna use Weber ocr. I’ve fixed cement board into the channels for good base. Do they need priming? Can I prime with sbr, as I’ve got loads left from another job, or should I use something like sika rendergrip? I’m trying to avoid buying that as it’s flamin expensive and I only need a bit

ta
 
Uncle
Monkey Hug GIF
 
Weber state to only use lac rapid onto cement boards if I’m correct mate worth bearing in mind
 
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