Common problems and causes of putty - Shanghai ShiCi International Trading Co., LTD.

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Shedding: Phenomenon: The bonding strength between the putty and the base is poor, and it falls off directly from the base.

Cause:
1. the old wall surface is very smooth (such as tempered putty, polyurethane, and other oily paint), putty powder and its surface bonding fastness.
2. the new wall surface using template pouring, smooth surface and contains a large number of release agent (waste oil or silicone).
3. for wood substrates, metal substrates, such as non-mortar substrates (such as plywood, Guean, particle board, solid wood, etc. on the direct scraping putty, due to the surface expansion and contraction ratio, and the type of product water absorption is strong, rigid interior wall putty can not be deformed, generally after 3 months will cause shedding.
4. putty surpasses the shelf life, the bond strength reduces.

Workaround:
1. the elimination of abscission layer, according to the following conditions to deal with;
2. the old wall surface grinding, increase surface roughness, and then with the interface agent treatment;
3. Remove the Surface release agent or other grease ingredients with oil remover, then apply scraping putty.
4. the use of two components or special Composite board putty for construction.
5. marble, mosaic, ceramic tile external wall surface, please select special exterior wall renovation putty bottom.
6. Use in the Putty shelf life.

Foaming: Phenomenon: During the construction process bubble and after a period of time, putty surface foaming.

Cause:
1. the base is too coarse, the batch swings too fast;
2. once the construction putty layer is too thick, more than 2.0 mm;
3. the basic water content is too high, while the density is too large or too small. Because of the rich gap, and the high moisture content of putty, so not breathable, air is closed in the void cavity, not easy to eliminate.
4. construction after a period of time, only on the surface of the burst bubble, mainly caused by mixing uneven, slurry containing too late dissolved powder particles, after construction, a large number of absorption of water, swelling formation burst.

Workaround:
1. a large area foaming putty surface, with a shovel knife directly crushing the small bubble mouth, and then reuse the appropriate putty to apply the foaming surface.
2. putty in general after mixing evenly, static after 10 minutes or so, and then use the electric mixer to stir again after the wall.
3. the construction of the second or last surface bubble phenomenon, should be before the elimination of the watermark with the squeegee to remove the treatment, to ensure that the putty surface does not appear bubble.
4. particularly rough metope, the general bottom material chooses thick putty as far as possible.
5. in the wall too dry or strong wind light environment, the first as far as possible with the water wetting metope, to the wall body without a clear, after the putty layer of scraping.

Powder Removal: Phenomenon: After the completion of construction and dry, touch with the hands of the phenomenon of powder.

Cause:
1. the interior wall putty powder polishing time Master is not good, the surface has been dry after polishing treatment will take off powder;
2. the external wall putty powder, finishes the coating is thin, in the summer high temperature, the moisture is volatile quickly, the surface layer does not have enough water to solidify, thus easy to remove the powder.
3. the product surpasses the shelf life, the bond strength drops greatly.
4. improper storage of products, the absorption of moisture after a substantial decline in adhesion.
5. the grassroots water absorption rate, resulting in rapid drying putty, there is no sufficient moisture for curing.

Workaround:
1. the interior wall Putty surface polishing to master the appropriate polishing time, the best polishing period is to be putty surface watermark disappeared, immediately after polishing. The practice has proved that veneering 1~2m2 should be pressed or polished.
2. external wall putty surface drying, to carry out appropriate grinding, and adequate water, general maintenance is divided into two or more than two times.
3. the product must be used in the shelf life, if more than the shelf life, must be tested scrape, after the inspection qualified, and then the construction;
4. the product must pay attention to waterproof treatment, should exist in a cool and dry place, and ensure that the package is sealed intact.
5. summer or high temperature and strong wind conditions, in the application of scraping putty before it is best to moisten the wall, the wall surface without water can apply scraping putty.

Delamination: Phenomenon: Putty two layers or between putty and the substrate peel off each other.

Cause:
1. the substrate contains a large number of release agents (such as waste oil, wax emulsion);
2. The base is seriously powdery and the water absorption is too large.
3. the bottom putty powder is serious, the lower layer putty is too hard, dry too fast also will cause to fall off.
4. two layers of putty between the construction interval is too long, generally more than 15 days, veneering layer can sometimes cause delamination.
5. after the construction or construction of the putty layer by rain or other infiltration of water, resulting in the loss of effective components of putty, will also fall off.
6. two-layer putty collocation is unreasonable.

Processing method:
1. the elimination of peeling layer, the selection of special Putty batch swing;
2. the serious powder construction surface, preferably uses the sealed primer dilution liquid to seal, after drying, then carries on the corresponding putty layer or other construction
3. putty, especially interior wall Putty, as far as possible to shorten the construction interval of two putty;
4. pay attention to the construction process protection, in the putty construction process or within 8 hours after construction, putty best not to be water infiltration;

Cracking: Phenomenon: Putty Construction after a period of time, surface cracking.

Cause:
1. the grassroots not thoroughly dry on the construction, construction requirements of the grassroots water content ≤ 10%.
2. the bottom putty is not dry, on the surface, the surface first dry, and the inner layer is still drying process, resulting in a different layer of dry shrinkage, easy to crack.
3. the basic treatment, repair and leveling materials not thoroughly dry, above the scraping hardness of the interior wall putty, easy to cause cracking;
4. the construction is too thick, internal drying is slow, the surface drying speed is faster, also easy to cause cracking.

Workaround:
1. already cracked putty, need to eradicate, if the crack is not too big, also can use the flexible putty to carry on the first construction, then according to the standard construction way carries on the construction.
2. each construction should not be too thick, the two construction time interval must be greater than 4 hours, the front channel putty thoroughly dry, before the road to apply scraping.

Yellowing: Phenomenon: Refers to the putty construction completes, soon namely partial or all present yellow.

Cause:
Mainly occurred in the interior of the old wall, old wall putty used a large number of PVA glue, glue aging decomposition, produce unsaturated acid, unsaturated acid, and putty in the calcium ion reaction, produce the corresponding yellow calcium salt.

Workaround:
1. with environmental protection glue roll coating two times, thoroughly dry, and then the application of environmental protection of water-borne interior wall putty;
2. with white sealed primer roll coating Two, thoroughly dry, and then scrape putty.
3. all use paste putty construction, or use plate putty construction.