know this is an old post but,,,
its not difficult to regrade a porch to provide positive waterflow altho you won't find the mtls at any apron store,,, instead, look for a const supply house OR a dec conc supplier who's got ' just add water ' hybrid-polymer-modified cements in bags,,, we use elitecrete exclusively for its ease & constant quality,,, yes, all overlays need sealing to provide uv protection since they're colorable,,, we've not used ' shark's grip ' [ sher-wms ] which is ground polycarbonate,,, we use glass beads OR alum oxide.
paint's never a good choice for conc,,, you may wish to consider acid-stain instead,,, there're coatings that're much more satisfactory,,, removing the paint's a job for 7" grinder fitt'd w/diamond turbo cup wheel,,, we get ours from ' fc727 ' on ebay !
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