Rendering advice/problem

Hi there,

Live in an old stone cottage,just chopped a load of original lime/horsehair plaster off some of the kitchen walls,rendered it couple off weeks ago with 1st coat 3 sharp 1 soft 1 cement and redermix aditive,put the soft in as did a 3.1 originaly and it was too rough to work with,managed to get 2 coats on 1 area straight away no probs.The 2nd coat i put on today keeps sagging.looks like the waterproofer is not letting the 2nd coat suck on to it,i pva'd it before i started as well,not sure that was wise now.2 other areas i did toady 1st coat only are fine and gone off ok.

Anybody advise on best way for rest,should i get 2nd coat on while still green tommorrow and why the sagging.

Thanks for any advice

 

Cheers guys,
I have a load of lime left from builing so will try that and come to think of it when i knocked through the old gable end upstairs i rendered the walk through with lime and that was fine