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Frequently asked questions about exterior painting

Must rust always be removed before painting a metal surface?

Must mould always be removed before painting a surface?

The socle of our house was painted a couple of years ago. A light-coloured, "frost-like" layer developed on the surface, and the paintwork cracked and peeled off in places. What is the problem?

I repainted the internal doors of our home in an outdoor shed using Empire Furniture Paint. It has been several days now, but the paintwork is not yet completely dry. Is there something wrong with the product?

On the last day of my holidays I worked long hours to finish painting my house on time. The paint I used was oil-based Teho. The surfaces that I painted last were clearly duller than the surfaces painted earlier. What went wrong?

How should I repaint my PVC-plastic coated tin roof where the coating is partly peeling off?

I have a new concrete floor in my garage that I would like to paint. How should I do it and with what?

I am building a new log cabin by a lake. I’ve been wondering about surface treatment. When should a new log building be painted and what products should be used for this purpose?

How can I find out what type of paint has been used to paint the timber cladding on my house?
A simple way to identify the paint type is to use denatured alcohol. Clean a small spot of the painted surface with a cloth dipped in ethanol. Add more ethanol to the surface and rub it with your fingertip. If the paint becomes soft and squashy as a result of rubbing and the application of ethanol, the paint is a water-based acrylate paint. If the surface does not react, it is an oil-based paint.

Other properties of old oil-based paints, e.g. Teho Oil Paint and ValttiTeho Wood Finish:

  • the coat of paint is hard and crumbles when pressure is applied
  • the coat is chalky, leaving marks on fingers when rubbed
  • the coat of paint cracks in a chequered pattern
  • the coat of paint can be softened with lye which causes yellowing
  • the coat of paint is combustible and the smoke smells of burnt oil
Water-based acrylate paint properties, e.g. Pika-Teho, Ultra House Paint, and Valtti Opaque:

  • the coat of paint is resilient and does not crack when pressure is applied
  • not clearly chalky or powdery
  • cracks run parallel to the wood grains
  • paint is not softened or discoloured by lye
  • paint burns poorly, smoke smells of “plastic”

Properties of Swedish farm paint, e.g. Falu Red Paint:

  • mostly Barn red, sometimes yellow
  • does not form a solid coat of paint
  • powdery, pigment comes off when rubbed

What paint should I use to paint the floor and handrail of a new terrace made of pressure-impregnated timber?

What is the best weather for painting outdoors?

The roof of our house was rebuilt and covered with zinc-coated metal sheeting. When can I paint it?

Why have the colour of the external walls of my house changed over the years?