Once the render has been applied to the wall, use a straight edge (about 1.8 - 2 m long) to smooth over the render. Or just saturate with water before rendering with the lime. Then just before the end of this summer spray the outside wall with clear silicone water repellent. Cracks can be repaired with mesh or specialist methods before rendering over. The builders opening will have an active multifuel stove fitted in due course. Cheers, Allan. The plasterboard does not need to have any PVA applied - … No, never use PVA to prime a surface before applying tiles. I just knocked off the old plaster (approx 20mm) from and internal (external) wall as it was loose and sounded hollow. The scratch coat is the first layer of render to be placed on the wall. Pva on cement internal (external) wall before plastering? what i would do is weak pva over the bricks to seal it, then when dry a thick pva & render when tacky with 4 sand & 1 cement for both coats. Registered Join Date Aug 2003 Location. At this point I was left with the bricks, and I re-levelled the wall with cement and sand coat, and scratched it … Prior to plastering the whole wall, I'd neat PVA the lot and allow to go tacky before skimming. The acetic acid produced when cement and PVA come into contact would render the adhesive and grout useless.8 Mar 2016 Do I need to PVA bare brick before applying NHL 3.5 render in and around a fireplace builders opening. This creates a bit of a key for the render to stick to. Short answer. And before anyone says anything i did my neighbours garden wall like this 18 months ago & it's still there:RpS_tongue: If you render directly onto a dry masonry background then the render may not stick and eventually weaken due to a soft grip. Thank you. As the title suggests. Regards. 28th Apr 2004, 06:41 PM #3. ozwinner. Scratch Coat. You'll prob need to do that over two applications as its quite deep. ... Before rendering a wall, chip away the old render using a cold chisel, and spray the wall with a garden hose to prevent the rendering mortar from drying out as you apply it. For example, the first thing I do before I apply the render is to give the wall a light spray with water. Get that flush with the surrounding plaster and allow to dry. The acetic acid produced when cement and PVA come into contact would render the adhesive and grout useless. 1. Community Answer. New rendering should not be applied directly to ‘dry’ surfaces which have not been coated with PVA or Gripbond type liquids which stop the render drying out too quickly and helps adhesion. Apply it to the hacked off area,let it dry and render over. I have used PVA glue in render with no adverse effect, paint some on the wall first, as well as putting it in the mix. Do you need to PVA walls before tiling? If you PVA bits of the wall the skim will start drying out at different times and make skimming a pita. 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