Painting gritty exterior plastered walls?

Oriainarama

I'm completely clueless about most things DIY so stay patient with me.

I recently got my garden walls plastered and they have a kind of rough gritty finish to them.

Can I paint these walls in an exterior paint or do I need to do anything to them walls before painting them?

Also will the paint take the roughness off the walls?

Or do you recommend just leaving them unpainted?

Thanks for any advice

ouxbbkqtswdfaw

Hi, I'd paint the walls Sandex or weathershield, it would help to hide the roughness. If you have wall caps, paint first with white spirit diluted oil based white undercoat paint and let it soak into the caps. Then give a second coat of full undiluted oil based white undercoat, and finally a coat or two of your chosen exterior paint. Separate but matching colours for the wall and caps.

Oriainarama

ba7y6q321utkxv wrote: »

Hi, I'd paint the walls Sandex or weathershield, it would help to hide the roughness. If you have wall caps, paint first with white spirit diluted oil based white undercoat paint and let it soak into the caps. Then give a second coat of full undiluted oil based white undercoat, and finally a coat or two of your chosen exterior paint. Separate but matching colours for the wall and caps.

Thanks for the reply. I haven't got the walls capped, so I can just apply weathershield directly to the walls with no other prep and it'll turn out OK and take some of the roughness out of the walls. Thanks

ouxbbkqtswdfaw

I'd brush down the wall first, to remove any loose grit. Then dilute the first coat. Easier for you to put it on. The second coat undiluted, it will flow on after the first coat. I'd add about a litre to the 10litre bucket. Personally I put about 4 litres in a paint bucket (not tray) and add about 1/2 litre just so it's manageable and not watery. Best of luck!

Oriainarama

ba7y6q321utkxv wrote: »

I'd brush down the wall first, to remove any loose grit. Then dilute the first coat. Easier for you to put it on. The second coat undiluted, it will flow on after the first coat. I'd add about a litre to the 10litre bucket. Personally I put about 4 litres in a paint bucket (not tray) and add about 1/2 litre just so it's manageable and not watery. Best of luck!

Great I think I'll give it a go. The wife still doesn't want to paint them but I think they look unfinished and will look much better painted. Thanks for the tips

dodzy

Get 5l of stabilising primer. Apply to newly plastered surfaces with roller. Allow dry overnight. Paint away with 2 coats of weather shield. Forget all that diluting 1st coat stuff. The primer is the key. Costs about 30quid for 5L but that'll cover a large area.

Oriainarama

dodzy wrote: »

Get 5l of stabilising primer. Apply to newly plastered surfaces with roller. Allow dry overnight. Paint away with 2 coats of weather shield. Forget all that diluting 1st coat stuff. The primer is the key. Costs about 30quid for 5L but that'll cover a large area.

Thanks I'llook into that