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ROLES & RESPONSIBILITIES TO PAINTING NEW SURFACES


A.  Cementitious Surface

Surface Preparation – Cement Work Contractor
  Description   Requirement
a. In general cementitious surfaces may be highly alkaline especially when new. The moisture and alkalinity in fresh masonry may combine to attack many types of coatings by a process called hydrolysis which subsequently leads to film deterioration (chalking, colour fading, loss of adhesion etc.). Depending on the environment, the substrate needs at least thirty (30) days to cure or until a maximum surface pH of nine (9) is realized.   pH reading below  nine (9) -  (with pH paper or pH pencil on wetted surface)
       
b. Moisture content in the substrate can be checked with a moisture detector. A typical unit would have simple indicator showing the levels of dampness at which painting is permissible or otherwise.   Moisture Content [below sixteen (16) Wood Moisture Equivalent, WME] with Protimeter
       
c. Cracks must be patched using appropriate compound such as mortar, plaster, caulk etc. paying attention to the suitability of the materials in your application (exterior or interior).   Choice of patching compound or plastering must be compatible to specified paint system; use cellophane tape to test adhesion to substrate
       
d. Joints and patches must be checked for its pH level as well before painting, with the same treatment as the cement substrate.   pH reading below nine (9)
       
e. In the event that a particular surface is repeatedly (over a span of Two (2) months) detected with moisture content above the minimum requirement as stated after the normal curing period, it is evident that a moisture source is present. The source of moisture must be permanently eliminated by filling all cracks with suitable patching compound and repair any leaks. Once the rectification job is done, a follow up test is to be carried out to ensure compliance.   Moisture content after rectification should be below sixteen (16) WME and pH below nine (9)
       
f. Efflorescence, crusty white salt deposits leached from masonry as moisture passes through, is common in many masonry surfaces. It must be removed thoroughly prior to painting and the cause must be determined and corrected to avoid reoccurrence on painted surfaces.   Absence of any salt deposits on surfaces

 

Paint Application – Painting Contractor
  Description   Requirement
  Priming:    
a. When all surface preparations have been carried out soundly, the surface is ready for painting. The first coat of paint to be put on would be the alkaline resisting sealer which could be in the form of water or solvent based. The main function of the sealer or primer is to prevent any possible alkaline attack from the substrate and to promote better adhesion for the finish coat.   Alkaline Resisting Sealer:
One (1) coat of TRANS PAINT Nu-Cote Wall Sealer; One (1) coat of TRANS PAINT Pluss AP Sealer if Choice of finish is TRANS PAINT Nu-Cote OceanGlo
       
b. The sealer [one (1) coat] must be let to dry-out for at least twenty four (24) hours before proceeding with the finishing coats. On the other hand, it must not be exposed for more than one (1) month to avoid paint film deterioration.   Twenty four (24) hours coating interval
       
c. A check on the pH level should show lower values than that obtained on the substrate.   pH reading below nine (9)
       
  Finishing:    
d. A 100% acrylic system finish is usually recommended for exterior job. For interior application, acrylic or modified acrylic system finish can be used. Two (2) coats are required to give optimum overall durability.   Acrylic Finish:
Two (2) coats of TRANS PAINT Nu-Cote Weather
Modified Acrylic Finish:
Two (2) coats of TRANS PAINT Nu-Cote Emulsion or TRANS PAINT Nu-Cote OceanGlo
Maintenance - Owner
a. Periodical cleaning of the exterior surface is deemed necessary and can reduce the detrimental affects of time, abrasion, the environment, impact, and other forces have on the aesthetic and protective properties of the paint. An interval of twelve (12) months is recommended between each cleaning, depending on environmental conditions.

 

B.  Metal/ Ferrous Surface

Surface Preparation – Metal Work Contractor
  Description   Requirement
a. When iron and steel surfaces are exposed under atmospheric conditions, rust will form very quickly. Rust is an unstable matter to paint on. It can cause paint to destabilize and cause further corrosion beneath the paint film due to electrolytic action. Rust and millscale can be removed by manual or mechanical cleaning.   Surface must be free from rust or millscales
       
b. Oil, which is usually applied for protection after processing of the metal, will affect paint adhesion.   Surface must be free from oil or grease
       
c. Foreign matter in form of salts, dust or other forms of chemicals can contribute to paint adhesion problem.   Surface must be free form of dirt and contaminants

 

Paint Application – Painting Contractor
  Description   Requirement
  Priming:    
a. After the surface has been thoroughly cleaned, priming should be done quickly to prevent rusting.   Anti-Corrosive Primer:
One (1) coat of TRANS PAINT Pluss Industrial Zinc Phosphate Primer
       
b. As primers are not intended to withstand the weather, an undercoat should be applied to exposed surfaces within four (4) weeks.   Undercoat:
One (1) coat of TRANS PAINT Pluss QD Undercoat
       
  Finishing:    
c. An alkyd gloss finish is usually recommended for the job. Two (2) coats are required to give optimum overall durability.   Alkyd Gloss Finish:
Two (2) coats of TRANS PAINT Nu-Cote Gloss

 

C.   Wooden/ Timber Surface

Surface Preparation – Wood Work Contractor
  Description   Requirement
a. As moisture is one of the major causes of paint defects, wood surfaces that are to be painted should be checked to avoid blistering.   Moisture Content [below sixteen (16) Wood Moisture Equivalent, WME] with Protimeter
       
b. The wood surface should be clean, smooth and free from surface defects by patching with suitable wood filler/ putty.   Choice of patching compound or plastering must be compatible to specified paint system; use cellophane tape to test adhesion to substrate
       
c. Unstable splinter and foreign matter should be removed by sanding followed by a wipe-off with a damp cloth before the first coat of paint is applied.   Surface is free from loose particles and contaminants

 

Paint Application – Painting Contractor
  Description   Requirement
  Priming: (No primer required for transparent varnish/ floor dressing)    
a. After the surface has been thoroughly cleaned, priming should be done quickly to prevent deterioration.   Aluminium Wood Primer:
One (1) coat of TRANS PAINT Pluss Aluminium Wood Primer
       
b. An undercoat is recommended for the foundation of the gloss finish. After being applied, let it dry thoroughly before sanding it down followed by a wipe-off with a damp cloth before the finishing paint is applied.   Undercoat:
One (1) coat of TRANS PAINT Pluss QD Undercoat
       
  Finishing:    
c. An alkyd gloss finish is usually recommended for the job. Two (2) coats are required to give optimum overall durability.   Alkyd Gloss Finish:
Two (2) coats of TRANS PAINT Nu-Cote Gloss
       
d. For transparent varnish/ floor dressing, three (3) coats of finish are required with sanding after the first and second finishes followed by a wipe-off with a damp cloth before the final finishing coat is applied.   Transparent Gloss Finish:
Three (3) coats of TRANS PAINT Nu-Cote Timber
       
e. Where extra exterior durability is required, a full acrylic sheen finish emulsion is usually recommended. Three (3) coats are required for best result.   Sheen Finish:
Two (2) coats of  TRANS PAINT Nu-Cote UVWood

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