How to replace the primer?

Firming Blend

Soap, glue, copper sulfate

Strengthening is necessarily required for plastered or concrete surfaces - the main task of such a primer is even better to "bond" the particles of the coating together and protect the wall from shedding. To prepare a solution to improve strength at home, you will need:

• 1 piece of laundry soap (~ 25 rubles per 200 g);
• 100 g of copper sulfate (~ 100 rubles / pack);
• 500 g of dry bone glue (~ 250 rubles);
• 7 liters of clean water.

So, 7.8 kg of primer will cost you about 375 rubles. For comparison, 5 liters of CT 17 primer from Ceresit costs an average of 630-650 rubles. But to save almost 2 times, you will have to spend a little time:

1. Pour 7 liters of water into a metal container (an unnecessary pot or bucket will do).
2. Place on the stove.
3. As soon as the water starts to boil, rub or finely chop the laundry soap.
4. Pour the soap into boiling water, stirring with a stick or wooden spatula until it dissolves completely.
5. Set the minimum temperature on the stove.
6. Add glue and vitriol.
7. Get in the way.
8. Cover and leave for half an hour.
9. Strain the warm slightly cooled mixture through cheesecloth, leave to cool completely.

Apply the cooled mixture to the walls with a brush or roller. Thanks to glue and soap, the coating will harden, and copper sulfate will protect against mold and mildew.

Deep penetration composition

PVA glue and cement

A separate class of primers is designated by the “deep penetration” nameplate. The primer is used for highly absorbent substrates: it prevents the formation of dust, strengthens and, most importantly, reduces and evens out the absorbency.

For deep penetration soil preparation will need:

• 1 liter of PVA glue (from 80 to 300 rubles per 1 kg);
• 1 trowel (~ 200 g) of cement (20 rubles per 1 kg);
• 8 liters of clean water.

The total cost of 9,200 kg of primer is from 100 to 320 rubles, depending on the type of PVA glue. Liquid plasticizing composition is the cheapest, it is excellent for making a primer. But in order to minimize the absorbency as much as possible, you can take expensive PVA glue - for example, Moment Joiner. It is more concentrated and has better adhesive properties.

For comparison, 10 liters of Bergauf TiefGrunt solution will cost about 595 rubles.

It is much easier to prepare a deeply penetrating solution than a strengthening one, especially if you arm yourself with a construction mixer.

1. Pour 8 liters of warm water into a basin or bucket.
2. Add 1 liter of PVA glue, mix thoroughly until completely dissolved.
3. Add cement, mix again. The composition is ready!

Important! Before covering all the walls with homemade primer, check if it has been prepared correctly.To do this, cover a small area with the composition and wait until it dries - there should be no film left on the surface that can be removed. If this is still formed (it happens when the PVA is too thick) - add a little water and test again.

To improve grip

The so-called adhesive primer improves the adhesion between the decorative finishing material and the substrate. But the finish is different and the soil for it also requires different. Let's analyze the main options.

Under the wallpaper

The surface under the wallpaper should not:

• crumble:
• become moldy;
• absorb the glue.

The primer is responsible for all this. To treat the walls, you do not need to buy a special composition or prepare it from complex ingredients - ordinary wallpaper glue is enough. Stir it at the rate of 100 g per 4 liters of water, apply to the walls with a roller or brush, wait until it is completely dry and start gluing.

Important! See package instructions: manufacturers often write the mixing ratio for pre-treatment themselves.

For painting

In order for the paint to lay down well and hold for a long time, it is necessary:

• strong (not loose) base;
• uniform level of moisture absorption;
• solid surface without stains.

Many experts simply dilute the paint with water, which in the future will paint the walls or ceiling and apply the first primer layer to it. But if the paint does not contain impurities against fungus and special adhesion additives, and it is to be applied on a very smooth surface (for example, on top of old oil paint), it is better to make a special solution.

For this take:

• a bar of laundry soap (~ 25 rubles per 200 g);
• 200 g of wallpaper glue (~ 70 rubles);
• 250 g of aluminum-potassium sulfate - alum (~ 300 rubles);
• 2000 g of chalk (~ 100 rubles per 1 kg);
• 30 ml of drying oil (~ 90 rubles per 500 ml);
• 3 liters of water.

Alum can be purchased at a pharmacy or shop for the manufacture of cosmetics, perfumery. Chalk in powder is found in hardware stores, where you will also find glue and drying oil.

5700 g of finished primer will cost about 600 rubles.

1. Add 1 liter of boiling water to the alum.
2. Grind the laundry soap with a grater.
3. Dilute the glue in 2 liters of water, avoiding the appearance of lumps.
4. Heat water with glue over low heat, add soap shavings, wait until it is completely dissolved.
5. Pour in drying oil and diluted alum, add chalk powder, mix thoroughly so that there are no lumps left.

Important! The primer should be liquid - if the composition is very thick, dilute with boiling water to the state of kefir or even milk.

For wood processing

Wood primer deserves special attention. Buying a primer in a store, you immediately see what tasks it solves, usually it is protection from moisture, fungus, insects and fire. Thanks to the primer, the service life of the topcoat (paint, varnish, stain) is also increased.

For wood, the recipe described above is suitable - using alum and drying oil. But if this option seems too difficult for you, try the simplest PVA-based solution. To do this, mix 1 part glue and 2 parts water. For example, 500 g of glue and 1 liter of water.

The cost of the finished composition will be estimated by the cost of PVA - from 80 to 300 rubles per 3 kg.

Even if it is impossible to find a primer in your shops, do not skip this step during repairs. Feel free to do it yourself, especially since some recipes contain very simple components that can be found at the nearest outlet.