Top quality alkyd based undercoat flat and level base for topcoats.

  • Easy brushing, good flow and levelling;

  • Provides maximum durability to Enamel topcoats;

  • Excellent sanding and topcoat adhesion;

  • Superior Enamel Hold-Out.


  • General purpose Undercoat for all interior and exterior primed metal, wood, plaster and various types of composition boarding;

  • Highly recommended as an Undercoat for High Gloss Enamel, Eggshell, and Flat White.

  • Cover stains and water marks on Gypsum Board and Stained Ceilings before applying CLASSISEAL PRIMER™ and Final Paint.


  • TYPE  -  Modified Medium - long oil synthetic alkyd resin;

  • DRYING TIME  -  Surface: 3 - 4 hours (23° Celsius and 50% relative humidity);

  • HARD DRY  -  Hard dry: 14 - 16 hours (at 23° Celsius and 50% relative humidity);

  • OVERCOATING  -  Min. 16 Hours (overnight) at 23° Celsius and 50% relative humidity);

  • VISCOSITY  -   94 - 96 KU;

  • SPECIFIC GRAVITY  -  1.38 - 1.42;

  • FINISH  -  Slight Sheen;

  • WEIGHT SOLIDS  -  64% - 66%;

  • VOLUME SOLIDS  -  44% - 45%;

  • SPREADING RATE  -  7 - 8m²/litre (to obtain a continuous film without full coverage);

  • COVERAGE (THEORETICAL)  -   6 - 6.5m²/litre;

  • FLASH POINT  -  Over 21° Celsius;

  • COLOUR RANGE  -  White plus a range of pale colours can be tinted on special request;

  • PACKING SIZE  -  1 Litres and 5 Litres.

All above technical data are based on Universal Undercoat White. Coverage/Spreading rate of colours depend on condition and porosity of the surface and the manner in which Universal Undercoat is applied and used.


  • READY   -  Ready for use with brush or roller;

  • SPRAY  -  For spray application, thin with Mineral Turps;

  • THINNING  -  Not normally recommended except for application by spray;

  • EQUIPMENT CLEANING  -  Mineral Turps.



  • Clean to remove dirt, grease, dust, etc;

  • Sandpaper smooth and dust off;

  • Apply knotting to all knots and sand smooth when dry;

  • Spot Prime all nails and metal parts with Etch Primer;

  • Apply one coat of Wood Primer;

  • Apply one coat of Universal Undercoat;

  • Allow to dry and finish off with enamel as per your requirement.


  • Remove dust, dirt and plaster splashes;

  • Cut out large cracks and imperfections;

  • Fill with a recommended Crack Filler - sand smooth when dry;

  • Apply one coat of Classiseal Plaster Primer;

  • Ensure that surfaces are completely dry before application;


  • Allow to dry and finish off with enamel as per your requirement.


  • Loose surface rust must be removed by wire brushing;

  • Remove all grease and oil with detergent solution or Mineral Turps;

  • Apply one coat of Red Etch Primer. Allow to dry;

  • Depending on the severity of the conditions, apply a second coat and allow to dry;


  • Allow to dry and finish off with enamel as per your requirement.


  • Surfaces must be in sound condition;

  • Loose flaking paint must be completely removed;

  • Bare areas must be spot primed with an appropriate primer;

  • Build up bare patches with CLASSIC UNIVERSAL UNDERCOAT™ to the same level as the rest of the paintwork;


  • Allow to dry and finish off with enamel as per your requirement.


  • Not suitable as a primer for metal surfaces;

  • Not suitable on alkaline surfaces. In these conditions, Classiseal Plaster Primer should be used;

  • When CLASSIC UNIVERSAL UNDERCOAT™ is dry, there should be little or no gloss. A glossy surface indicates that CLASSIC UNIVERSAL UNDERCOAT™ has been applied too liberally;

  • Conversely, a loose or powdery surface after application of Universal Undercoat indicates that CLASSIC UNIVERSAL UNDERCOAT™ has been applied too sparingly and a further application is required;

  • Do not use Lacquer Thinner or Methylated Spirits for diluting as this will alter or destroy the quality and performance of CLASSIC UNIVERSAL UNDERCOAT™;

  • Clean all equipment and tools with Mineral Turps after use.


  • The ambient temperature must be between 5ºC and 35ºC and humidity between 10% and 85%;

  • Do not paint too early as the wall may still be damp - paint only when the walls are dry;

  • Do not paint in too hot weather, rather paint early morning and after lunch, the slower the paint dries, the longer it lasts;

  • Excessive application thickness and/or rapid drying could lead to cracking;

  • Avoid applying under adverse weather conditions as this could result in poor product performance;

  • Excessively friable surfaces should be cleaned down prior to primer application.


Painting is a relatively user-friendly activity if the proper precautions are taken to ensure safety

  • It is advisable to wear gloves as CLASSIC UNIVERSAL UNDERCOAT™ is difficult to remove from skin;

  • Always keep out of reach of children and animals;

  • Do not take in orally - harmful if swallowed. Seek medical attention and do not induce vomiting;

  • If accidental contact with skin, wash immediately with soap and water or a good quality skin cleaner;

  • If accidental contact with eyes, rinse immediately with plenty of water and seek medical advice;

  • Wear a respirator if the area being painted cannot be adequately ventilated, and work for short periods only;

  • Ventilate the area to be painted, opening all doors and windows and using fans during application and drying;

  • Protect floors with cloth Drop Cloths, not plastic, which is far more slippery;

  • Do not paint or store paint near any heat source such as a water heater or fireplace, and never smoke while painting;

  • Make sure your ladder is in good shape. Set the legs on an even surface and lock the cross braces. Do not stand on the top of the ladder nor on the utility shelf. If you are having difficulty reaching a spot, get down from the ladder and move it rather than leaning out;

  • Clean up carefully and thoroughly when you are done for the day;

  • If rags have alkyd paint or thinner on them, leave them to dry outside to avoid any chance of spontaneous combustion;

  • Choose an area inaccessible to children and pets, and when they are thoroughly dry, take them to a toxic-waste dump site.


Different surfaces and environmental conditions require specific painting systems to produce the best possible results - It is, therefore, recommended that you contact a representative from Classic Paints for advice on all your painting requirements, whenever possible.

The information, and, in particular, the recommendations relating to the application and end-use of Classic Paints products, are given in good faith based on Classic Paints’ current knowledge and experience of the products when properly stored, handled and applied under normal conditions. In practice, the differences in materials, substrates and actual site conditions are such that no warranty in respect of merchantability or of fitness for a particular purpose, nor any liability arising out of any legal relationship whatsoever, can be inferred either from this information, or from any written recommendations, or from any other advice offered. The proprietary rights of third parties must be observed. All orders are accepted subject to our current terms of sale and delivery. Users must always refer to the most recent issue of the Product Data Sheet for the product concerned, copies of which will be supplied on request.


20/05/2022 - This supercedes all previous publications - This technical data furnished is obtained from controlled laboratory tests under ideal application conditions. No guarantee of any performance characteristic is given or implied and we do not hold ourselves responsible for any consequential damage of whatsoever nature that may arise from use of our products. In the event of a proven product fault our liability will be limited to the replacement of the product only. It is the users responsibility to confirm the currency of product data sheets.

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