Need help on what paint to use on my outside steps?

We run a home daycare so we have a lot of traffic up and down our front steps. The people who owned the house before painted them with outside gray paint. So I tried another house paint and it’s still chipping off. What should I use for them? They are in all weather (rain,sun,snow) and they have a lot of traffic... show more We run a home daycare so we have a lot of traffic up and down our front steps. The people who owned the house before painted them with outside gray paint. So I tried another house paint and it’s still chipping off. What should I use for them? They are in all weather (rain,sun,snow) and they have a lot of traffic everyday. Thank you!
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