should i seal before painting exterior rendered house?

[devs]

Hi all, I'm currently working my way around the exterior of my house using dulux weather shield. I totally underestimated the amount of paint that I required. The manufacturers guides are well out. I. Bought 9 x 5l tins and am not even half way around.

The walls are a smooth render (on 3 plus year) that has be jetted.

I wondered if I should be adding any pva or sealing first to get more out of the paint?

Cheers, Devs.

 

[Morpheus Cane]

9 tins used, you must have one very big house, should be getting 16m² per litre so that's 80m² per tin and 720m² with 9 tins even if you half that that is still a large area
You can thin it one part water to ten parts paint and see if that improves the flow, I'm guessing it's been previously painted.

 

[Robbie uk]

Don't use PVA anywhere near it. If the render is raw, a thinned down mist coat of whatever your using is suffice. If its already painted, as Morpheus says, thin your paint a bit to aid flow and coverage.