Reasons and solutions for putty foaming

Putty powder is a kind of architectural decoration material, the main components are talc powder and glue. Just purchased a layer of white on the surface of the rough house is putty, usually putty whiteness in the 90s and above 330 fineness.
01
the reason for putty foaming explains
putty powder
: the construction process produced foaming and after a period of time, putty surface foaming
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02
the rough mortar base surface foaming
phenomenon
: putty hanging up dense and small bubbles.
Cause of formation
: the mortar substation is too rough, there are many small pits, scraping putty, the air inside the small pit is compressed, air can not be effectively discharged, pressure released after the top of the putty film, the formation of bubbles.
solution: Roll a liquid interface agent with a roller, or a coarser powder interface agent, dry and then hang the putty as thick as possible.
03
poured concrete air eye blistering
phenomenon
: bubbles appear on the substation, not only the drum is very high, but also after the puncture inside is also very deep.
Cause of formation
: batch scraping putty base surface is the concrete substate, the surface has a mold release after the dense air eye, in such a base surface scrape, the air eye is sealed by putty paste body, gas in the air eye is compressed, will form a build-up of potential energy, and then when the scraper leaves the air eye, putty paste body by the air eye sealed compressed gas rebound to form bubbles.
solution: scrape the first time with a thick putty with low viscosity, or scrape the first time with a quick-forming plaster that doesn't bounce.
04
Shaving the second putty foaming
the formation of the reason:
such a situation is often hung the first putty has not eliminated the bubble, scrape the second putty, habitually take a blade to level, the first bubble cut, back to the above two cases, belong to the same reason: in one air eye continue to produce new bubbles.
solution: Don't break the first bubble, keep looking for flat putty or scrape with plaster.
05
concrete ceiling foundation foaming
phenomenon
: generally will be larger bubbles or empty drums.
reason for the formation:
concrete ceiling substation smooth and inconvenient construction, brushing force is not uniform, resulting in putty layer can not be firmly bonded, coupled with the gravity of the putty layer itself, resulting in foaming.
solution: it is recommended to apply putty before interface treatment, completely dry after the use of low viscosity and flexible putty products for rolling coating.
06
grass has floating ash or powdering caused by blistering
phenomenon
: generally will start a larger bubble or drum off layer.
the formation
: grass-roots powdering or a large number of floating ash, brush putty can not effectively bond the occurrence of bulging or blistering.
solution: clean up the ash or remove the weak grass before applying putty.
07
Putty raw material causes foaming
the formation of the cause
: the use of sticky high or easy to inhale cellulose and glue powder lead to putty film is very strong, the grass-roots gas is closed so that can not drain bubbles;
solution: the use of moderate viscosity, not easy to attract gas powder cellulose raw materials and high-quality gray calcium products, putty stirred and then left for about ten minutes before scraping.