The float coating

The float coating

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Trowel Trough Coating knives Sandpaper Corner knife Filling powder coating or all ready with variable particle size You can do it yourself, using water-based coating, with variable particle size loads, or l 'buy ready to use. It is a finish that will do wonders, especially on new and a little too "wise" walls.

The step by step


In the trough, add 8 volumes of plaster to 3 volumes of water and roughly mix in order to obtain a lumpy paste. Let sit for 15 minutes.


If you find yourself facing large cracks, open them, roughly recap them, then put a strip of calico on the fresh plaster, ironing the knife to make it penetrate into the plaster. If the coating becomes hollow after drying, repeat the operation. If necessary, remove the burrs using the putty knife, and when the coating is dry, sand with fine sandpaper.


Start by coating the contours of windows and all openings. Use one of the blades to deposit the plaster while you use the other to smooth it. The thickness must not exceed 5 mm.


Then work the walls, from bottom to top, in passes of about 30 cm. The coating does not have to be perfectly smooth, especially if the grain size is large.


Finally comes the decorative contribution: the finish. You can, on this fresh coating, obtain very different effects using a simple brush (brushed effect), or a honeycomb roller which will form very marked roughness (screened effect) ... These can be slightly crushed with a float. You can also scrape the wall with a scrape, smooth it with a trowel ... The ideal is, of course, to test on approximately 1 m2 and to judge the result!


For a few years there have been tinted paste plasters which "spread" - that's the right term - directly on the wall. They apply to the trowel and work until the desired finish is obtained ... Very easy to use, just avoid excess or lack of product!


There are also fatty oil coatings, but for this type of finish, choose the water coating which dries more quickly and forms much more obvious and marked asperities. For a perfectly ecological site, you will find natural plasters based on calcium carbonate which have a very long service life and are easy to apply. Depending on the size and appearance of the aggregates (sand, gravel or gravel), some of these finishes benefit from being lightly sanded to bring out the accidents in the wall. In the case of a very rough finish like this, it may be advantageous to color the coating in the mass, at the time of making. Then, a tinted wax, a white or tinted whitewash will complete the task in beauty. Know-how - home decor © La maison rustique - éditions Flammarion, 2006