Anuprime - 291 : Vinyl Wash / Etch Primer  


Product Description :


Anuprime - 291 Wash Primer is two-component self-etch primer suitable for use on non-ferrous metals to provide excellent inter-coat adhesion between the substrate and the top-coats since adhesion of coatings is poor on galvanized iron, aluminium, zinc, light alloys etc. The triple action of this coating of phosphating, passivating and sealing explains excellent results achieved in protecting the surface and preparing it for further coating. It can also replace the difficult phosphating pre-treatment of metal used in shipbuilding. It is also known as etch primer, metal conditioner primer, pre-treatment primer and holding primer.

Features and Benefits :

Can be applied either by conventional or airless spray. Only small areas can be brushed.

Can tolerate surface moisture and damp when applied.

Ease in handling and application.

Excellent adhesive bond with minimum air-cure time which then allows immediate application of the next coating.

Has ideal touch-up capabilities, even in applications that require spot-welding.

Most commonly used at the job-site as blast or holding primer.

Modifies the metallic surface to produce a tightly adherent film composed of chromates, phosphates or oxides.

Has fast dry and re-coat times.

While inferior surface preparation can never be recommended, ANUPRIME-291 WASH PRIMER can tolerate adverse conditions of surface preparation and applications with shorter life and can directly be applied over tightly adherent mill scale and even over small amount of rust.
Can be top-coated successfully with variety of topcoats such as alkyd, epoxy, polyurethane, vinyl, chlorinated rubber etc.
Can also be used to seal the rough open surfaces of zinc-rich primers before additional topcoats are applied.
Protects a metal surface temporarily from contamination that could lead to unwanted corrosion products.


  Surface Preparation :  


The surface should be blast cleaned to SSPC-SP10-63T or NACE No.2 i.e. loose rust and scales, dirt, grease, oil, paint, wax, weak oxide films and other contaminants should be removed. Blast cleaning to SSPC-SP-5-63 or NACE No.1 is recommended where heavy corrosive conditions exist. That means a surface with a grey white, uniform metallic color, slightly roughened to form a suitable anchor pattern for coatings. The surface is free of all oil, grease, dirt, mill scale, rust, corrosion products, oxides, paint and other foreign matter. In absence of blast cleaning, prepare the metal surfaces by removing loose mill scale, rust and loose paint by wire brushing, sanding, scrapping or chipping by hand or power tools.

Zinc, Aluminium, Galvanized Iron:

Remove all oil, grease, dirt, old paint, oxides and other foreign matter by wiping, etching or scrubbing with brushes. Degrease the surface with the degreasing solvents like xylene or tri-chloroethylene.


Do not apply wash primer at a heavier film than 8 microns. Otherwise, lack of adhesion in the coating system may result. Anuprime - 291 dries rapidly after application. It can be re-coated after 30 minutes and the maximum re-coating interval should not exceed 6 hours. If the maximum re-coat time exceeds, it must be re-primed. Mix Base and Accelerator in equal parts by volume and stir thoroughly for 4-5 minutes. The pot life is 4 hours only. After this time, the mixture may appear usable, but it will not provide satisfactory adhesion.

Anuprime - 291 Wash Primer can be top-coated with alkyd, chlorinated rubber, vinyl, epoxy, polyurethane and acrylic latex coatings. It is recommended that topcoats of acrylic modified nitro-cellulose lacquers shall first be tested for adhesion in small area.





Anuprime - 291


Two pack cold cured


Polyvinyl Butryal Resin / Rust inhibitive pigments.




Matt - Semi Transparent

Volume Solids (mixed)

9.25± 1%

Mixing Ratio

Base : Hardener

1 : 1 by volume

Pot Life @ 50% R. H. @ 30° C

4 hours

Dry film thickness per coat

8 microns 

Coverage-(theoretical-no loss)

11.5 m² /litre

Dry heat resistance

65° C

Serviceability @ 30° C

- Dry to touch

- Re-coat

- Maximum Re-coat time


5 - 10 minutes

30 minutes

6 hours

Application Temperature




10° C

35° C

Relative Humidity


Flash Point

21° C


Anusol - WPT Thinner


Flammable. Keep away from heat and open flame. Maintain good ventilation and avoid breathing vapours.


8 & 40 litres

Shelf Life

6 months

Notes :-  
Brushes and spray equipment should be cleaned with Anusol - WPT Thinner. Otherwise, the equipments may render unserviceable.
The contents should be stirred thoroughly prior to use.
When over-coating the weathered or aged Anuprime - 291, ensure that the coating is fully free from all contamination such as oil, dust, grease, stains etc.
This coating should always be thinned with Anusol - WPT Thinner. The use of alternative thinners can severely inhibit the curing mechanism of the coating.

Disclaimer :-


Information provided herein is based upon tests believed to be reliable. It does not guarantee the results to be obtained. Nor does it make any express and implied warranty or merchantability, or fitness for a particular purpose concerning the effects or results of such case. It does not release you from the obligation to test the products supplied by us as to their suitability for the intended uses. The application, surface preparation and use of the products are beyond our control and, therefore, entirely your own responsibility.

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