My black slate steps were fading to grey, so about a year ago I painted them with slate sealer. Yes they looked darker, but became a lethal slippery slide when it rained. Very dangerous. They have now faded unevenly.
My questions are, what can I use to remove this coating so I have an even coloured surface, even if it is grey? Are there any sealers that are not slippery when wet?
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