PVA applied in error - what to do next ?

Willyk

Hi, I decided to paint the window sills (exterior) of my house. They have been painted in the past but the paint is now starting to flake / crack. I scraped all the loose paint and then applied some PVA adhesive bond (1 part pva 1 part water), let dry and then applied 2 coats of Dulux Allweather white masonry paint. This all looked good until it rained. The paint looked like it was sliding off the sill in places (bubbling) and has changed colour in places so it now has a yellowish tinge to it. I now realise I should not have used the PVA ( I think ). What to do next ? The paint does not want to scrap off very easily. Options:

1. Sand with coarse sandpaper and give it another coat of paint ?

2. Apply some other sort of sealer and then paint more. e.g Allweather stabilising primer ?

3. Buy some Dulux weathershield allseasons and try it.

Thanks in advance.

Not really sure, any advice on this please.

MX5huggy

You've got to get rid of the PVA, sand it back

aliasojo

Agreed.

You need a sound base, you have to get the PVA off.

evoke

You could try using paint stripper and let that do its magic and then use sandpaper to get the sill back to stone/tiles. After that give it a good wash with sugar soap and a stiff brush, and hose that off to rinse it. Let it dry thoroughly before painting it again.

martinsurrey

I use

http://www.toolstation.com/shop/Painting+Decorating/Paint+Varnish+Removers/Paint+Panther+Paint+Varnish+Remover+1L/d150/sd2889/p15403

score the paint, apply, and brush off, easy.

(a also use it because its got a cool name, makes me think "you know, 60% of the time, it works everytime!")

http://www.youtube.com/watch?v=5ccp-lEmoAE

Willyk

Thanks for all the responses. PVA removal started. Once I have the pva removed, should I just paint direct or use anything before the paint ?

Dave_J_3

Are sills concrete or wood?

SBR is a water proof sealer and maybe suitable however I have never tried painting it.
I would remove PVA
Seal with SBR
External Undercoat
Top coat

auroan

What do the instructions for the paint say. Most external paints will tell you exactly what you should do (both for prep and application) to get a good result.