Advice please

Honestly mate don't worry too much, that paint would seal it up even without render.
Oh another bit of advice.
Don't under any circumstances let a full bucket of the paint fly about in the back of your van and spill everywhere. Not good.
Done that the other week drove off with back doors open. Bag of self levelling on first corner 5ltr of white emulsion on second. Local kids came knocking 5 min later to tell me. Feckers grassed me up. Road only resurfaced a month ago. Neighbours well happy. Banksy ain't got nothing on me.
 
looks shite I would only advise to knock down & get done correctly!!
Leave alone has been done diy & on cheap
Plus you clearly out of your depth here !!!!
 
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