Painting over an old surface

[sticky]

I have a garden wall that has been painted several times with a water based paint. I now

want to paint over this with an oil based paint, what preparation do I need to do to the surface

beforehand?

[JAS21]

Out of interest I googled ... seems oil base over water base is no problem ... so

Wash it

Lightly sand to provide a key

Undercoat

Lightly sand is a good idea

Top coat ...using quality paint

[sticky]

On 2/12/2019 at 6:52 PM, JAS21 said:

Out of interest I googled ... seems oil base over water base is no problem ... so

Wash it

Lightly sand to provide a key

Undercoat

Lightly sand is a good idea

Top coat ...using quality paint

Thanks

[kannot]

5 minutes ago, sticky said:

Thanks

JET WASH it better will fetch off any loose  paint, spray with fungicide then paint

[seajae]

you need to remove the oxidization from the acrylic paint as well as removing any loose/flaking paint, a good wash using sugar soap or similar then a good sand, you can use either an acrylic undercoat or oil based under coat then a light sand and dust off followed by the oil based. Acrylic is actually the better paint on exterior finishes as long as it is washed down every 12 months to remove the oxidization as this is what causes it to break down if left on, acrylic also will move/expand with the heat where as oil based will crack. Biggest problem in Thailand is getting decent paint, I have seen and used a water based gloss finish here, holds up very well and should out last an oil based paint

 

Edited February 14, 2019 by seajae

[David B in Thailand]

Paint remover is also available at most any paint shop in Thailand.