First, the reasons for putty blistering

1. Uneven mixing.

2. Putty with too much water, mix too wet.

3. The moisture content of the base is too high, while the density is too large or too small. Due to containing abundant voids. Putty with high water content, and thus impermeable, easy to make the construction process, putty powder layer of the lower part of the air contained in the air, not easy to discharge, so it will be easy to blister.

4. There are small holes in the base surface, when scraping and coating, the putty powder will squeeze the air in the holes, and the air bounces back into bubbles after squeezing.

5. The air permeability of the base surface with good sealing is poor.

6. Single-layer scraping is too thick, and the air in the putty layer is not completely squeezed out.

7. The base layer is too rough with small holes. When scraping, the putty compresses the air in the holes, and then the air pressure rebounds to form air bubbles.

8. The substrate is too rough, not sanded and smoothed, putty construction process is too fast wall batch, resulting in uneven putty powder caused.

9. Water-resistant paint, high grade concrete and other airtight substrate impermeable bubbles.

10. Putty is easy to produce bubbles during high temperature construction.

11. The water absorption of the substrate is too low. Lead to putty scraping relative water retention time is too long and make putty on the wall for a long time in the paste state but not dry, so that bubbles are easy to produce.

12. The wall is too humid.

13. Not easily squeezed out by the mud knife! And produce pinhole-like pores, is why the project batch scraping template top than the wall bubbles more than the reason, the wall absorbs a large amount of water, while the template top absorbs a very low amount of water.

14. Cellulose add too much.

15. Construction for a period of time, only after the surface of the bursting bubbles, mainly caused by uneven mixing, slurry containing powder particles that are too late to dissolve, after construction, a large amount of water absorption, dissolution and formation of bursting.

Second, putty blistering solution

1. large areas of blistering putty surface, with a spatula directly break the small bubble mouth, re-use the appropriate putty scraping blistering surface layer.

2. Especially rough wall surface, general primer as far as possible to choose coarse putty.

3. Clean up the wall surface (remove the loose wall surface), no oil pollution and dust.

4. Apply interface treatment agent 1-2 times to enhance the grass-roots solid and putty adhesion.

In the wall is too dry or windy light strong environment, first as much as possible with water to wet the wall, to be no bright water after the wall, putty layer scraping.

If there is a large area of blistering putty surface, use a spatula to directly break the small bubbles, and then re-scrape the blistering surface layer with the appropriate putty.

Generally, after mixing, putty powder should be left for 10 minutes or so, so that the various ingredients can be fully wetted and dissolved, and then mix again with an electric mixer before applying to the wall.

Putty construction should be repeated in the wall scraping, pushing and grinding, so that the putty and grass-roots level full contact, wetting, penetration, diffusion of the construction of the second or last layer of the surface layer of putty layer blistering phenomenon should be eliminated before the elimination of the watermarks with a spatula to pressure bubble breaking treatment to ensure that putty on the surface of the bubble does not appear.

Wall pre-preparation: such as prefabricated molding wall top vapor bubble is particularly serious, can first wet water treatment to let into the water absorption and discharge air. To be dry after the interface sealing treatment, and then coarse gypsum bottom leveling treatment, and finally scraping putty, vapor bubble phenomenon will be relatively good.

Putty scraping must not be too thick, putty function positioning: accurate decorative leveling materials. Putty is more to play with the surface of the latex paint connection, at the same time can be used as a surface decorative layer, scraping too thick easy to blister at the same time will also cause late wall drumming chances.

11. Construction of attention to the weather, air humidity of 75% or more, wall water content of 10% or more, avoid construction.