Sealing render

So I'm about to buy a new house which has been rendered with k rend I believe. I highly doubt it's been sealed and I've noticed a few houses already have some staining appearing in earlier phases. We get the keys end of September so by that time it will have been rendered for about 4 or 5 months. I was wondering if it would be worth my while applying a sealer to it once we move in?

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