skimming cement reveals with polyfilla - cement curing time?

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I've made the window reveals with cement and plastering sand. How long should I let the cement cure before skimming it with polyfilla? If painting, the answer seems to be 30-45 days, but if skimming with polyfilla, how long must one wait?
wait a sec.

you've got your s**t together to render some reveals and now you want to skim them with filler?

I think you've had a brain fart
Just found this on plasterers tips website for you. :RpS_thumbup: "When skimming polyfilla over sand & cement one must wait at least 21 days before any polyfilla activity commences, if this advise is ignored structural defects will occur"
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