Product reference: 2/01

Product title: PPA

Valid from: 17th December 2004

Last reviewed: May 2019

Type: A peroxide catalyzed, Glassflake polyester primer.

Suggested use

As a holding primer for ferrous substrates prior to application of Polyglass or Polyglass VE. Can also be used for adhesion promotion between existing Corroglass/Polyglass and repairs, or a new topcoat. PPA is alsousedfor priming concrete when suitably diluted, see data sheet SP5.


PPA is designed to react with the overcoat material for full cure, it cannot be used on its own except for a limited period in air.

Polyglass PPA should not be used in immersion service environments greater than 175 F (80 C) normal operating temperature.  Please contact your Corrocoat representative if the temperature meets or exceeds 175 F to discuss other options or Corrocoat coatings.

Health & safety

Before handling or using this product, the material safety data sheet should be read, and all precautions observed.

Surface preparation

Metals:Grit blast to SSPC-SP10 (ISO 8501-1 Sa) or equivalent. (For full details refer to Corrocoat Surface Preparation SP1).Concrete: Refer to Corrocoat data sheet SP5.

Application equipment

Airless pump of minimum 30:1 ratio is recommended with 10mm diameter (3/8”) nylon lined hose. Seals should preferably be of leather and PTFE and all fluid filters removed.Tip size .45mm to .75mm (18 to 30 thou) with reverse clean and a 45° fan pattern. Size of tip and fan pattern will vary dependent upon the nature of the work.Pressure to suit hose lengths and working conditions. (circa 200bar). Brush and roller may also be used.

Storage life

Base 1 year, Hardener 6 months, in unopened drums which should be stored below 75°F(24°C), away from heatsources and direct sunlight.

Color availability

Clear/slightly amber and light bluff.

Theoretical spreading rate

815 – 408 sf / gal at 2 – 4 mils WFT(20-10m2/litre at 50-100 microns WFT)

Volume solids

This material contains volatile liquid convertible to solids. Volume solids obtained will vary dependent uponpolymerization conditions. Nominally 92% of the contents are convertible to solid.

Practical spreading rate

Steel: Approximately 610 – 325 sf / gal at 2-4 mils dft(15-8 m2/litre at 50-100 microns WFT) Concrete:Approximately 408 – 245 sf / gal at 2 – 4 mils WFT(10-6 m2/litre at 50-100 microns WFT) Note: This information is given in good faith, but rate may vary significantlydependent upon environmental conditions, the geometry, nature of work undertaken and the skill and care of application. Corrocoat accepts no responsibility for any deviation from these values.

Specific gravity

1.055 mixed.


The use of thinners with this product is detrimental to its performance. Except for application to concrete, this product should not be diluted or thinned. Dilute only with styrene as recommended.


Apply a single coat to a wet film thickness of between 2-5 mils(60-120 microns). Over thickness will considerably increase tack free time and substantial over thickness is detrimental. The initial cure of this product is partially by airdrying and for this to occurit is essentialthat good ventilation is achieved. For use on concrete see separate Concrete Surface Specification Sheet CP1. PPA Primer should not be used at temperatures below 41°F (5°C) unless specifically made for low temperature application.

Recommended DFT

DFT is not specified. Wet film thickness should be checked and be within the range 2-6 mils (60-150 microns) during application.

Mixing ratio/mixing

98:2 base to hardener weight/weight.For temperatures below 64°F (18°C) add catalyst to base and mix vigorously with a mechanical stirrer for not less than 2 minutes. At temperaturesabove 64°F (18°C), firstadd retarder and stir with mechanical stirrer for 2 minutes. Allow 5 minutes before the addition of the catalyst stirred as above.Adding retarder after the catalyst will ruin theproduct.Procedures for spray application are like those for Polyglass, the Polyglass application data sheet should be read before the mixing of this product.


1 Gallon and 5 Gallon Kits

Flash point

78°F (26°C)

Catalyst type

Methyl Ethyl Ketone Peroxide, special blend Type P3.

Mixing ratio

98:2 base to activator by weight.

Drying time

Tack-free 90 minutes, 50°F at 2-4 mils (10°C at 60-100 microns) WFT. Tack-free 60 minutes, 68°F at 2-4 mils (20°C at 60-100 microns) WFT.


Dependent upon temperature and ventilation level, but minimum at 68°F (20°C) with good ventilation – 2 hours. Maximum at 68°F (20°C) – 28 days. Where long overcoating times are envisaged, care should be taken to avoid contamination of PPA Primer coating before application of subsequent materials. On concrete the special instructions regarding minimum overcoating timeshould be strictly observed. (SP5).

Cleaning solvent

Methyl Ethyl Ketone or Acetone before gelation.

Pot life

Variable dependent upon temperature, but approximately 2 hours at 50°F (10°C), 1 hour at 68°F (20°C).