Slate is also popular on roofs and facades because of its elegant natural look. In some cases, painting slate surfaces is still a desirable undertaking. The material is not a grateful object to paint. It is generally possible with special natural stone colors, but there is always a residual risk of insufficient hold.
Slate consists of changing substances
Before considering painting, it should be established beyond doubt whether the material is real slate. Imitations made from Eternit, for example, need completely different types and colors. If real slate is encountered, thorough cleaning and preparation can restore the appearance of a new stone.
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Basically, slate is a poor natural stone to be painted over. Its formation and classification is assigned to the border area between metamorphic rocks and sediments. This leads to a fluctuating density of the substance and different weighting of the ingredients. A color can only be applied evenly and permanently, if these properties are balanced and bridged.
Slate needs to be sealed
The basis for the aging of a layer of paint is "deep pore" cleaning, complete drying and a saturating primer. Put simply, a kind of insulating armor layer has to be established on the slate. So that we cover the most formative property of slate, the so-called foliation.
Theoretically, it is possible to "pour on" a generous amount of a film-forming coating, as is known from concrete surfaces (parking garage floors). Depending on the nature and pre-processing of the surface, this priming layer must also level any unevenness.
This is how paint (possibly) holds on to slate
Slate surfaces are best cleaned with a pressure washer and brushes.
2. let dry
Slate takes a long time to dry. Two to three days should be calculated in an environment with an outside temperature of around 25 degrees Celsius and moderate humidity (up to sixty percent).
Only primers suitable for natural stone from specialist dealers should be used according to the manufacturer's instructions. The common and common products from the hardware store are rarely suitable.
4th. To brush
Ideally, a natural stone paint from the same manufacturer as the primer is used.Tips & Tricks With the professional preparation of the surfaces, you can create effects on slate that often exceed expectations in terms of visual attractiveness. Try out different options on test areas before you decide to paint.