Painting soffits

[woodchip]

Any suggestions please on how best to deal with black mould on the external surface of my soffits.
Soffits have been made from 6mm external ply and painted with Barn paint.

Do I rub down, paint with anti-mould paint and then apply a couple of coats of Barn paint, back and front?

Many thanks.

 

[RogerS]

No. Cillit Bang mould remover first. Then wash it down. Then when you see the clean surface …….

 

[Cabinetman]

I think I’m right that the mould can’t get through or survive on a good unbroken layer of oil based paint, - the stuff we painted all woodwork with 20 years ago, also needs a semi porous damp environment.
What sort of paint is barn paint?

 

[Mike G]

........then apply a couple of coats of Barn paint, back and front?

Ideally, Bedec Multi Surface Paint, rather than Barn Paint. But only if you're applying it to an existing microporous water-based paint. NOT on top of an oil based paint.

 

[woodchip]

Thanks everyone for your replies.

Cabinetman Barn paint is a water based acrylic than can be painted over most surfaces without a base coat or primer. Iv’e used it to paint my workshop.

Thanks Mike, think that the way forward appears to be .. clean surface with Cillit Bang, thanks RogerS, rub down and apply 2 coats of Bedec Multi Surface paint. Having had a look online it looks as if I can possibly match my existing Barn paint colour of French Grey with the Multi Surface paint range.