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Products Techniques PT-402 Acid Etching Primer

Products Techniques PT-402 Acid Etching Primer is a polyvinyl butyral zinc chromate formulation that may be used to prime all plain or plated metallic surfaces. Priming surfaces with PT-402 Acid Etching Primer prior to priming with epoxy primer MIL-PRF-23377 or by itself will ensure maximum adhesion and protection of all bake or air-dry finish coats (including lacquer finish coats). The finely ground emulsions of zinc chromate pigments, resins and phosphoric acid hardeners are virtually non-settling. Once applied, the Acid Etching Primer requires no sanding and has a pot life of 8 hours. Extreme humidity can affect the bonding of the coating.

Product Type: Primer

Compatible Substrates & Surfaces: Metal

Features: Good Adhesion

Application Method: Spray

Chemical Family: Vinyls, Vinylics & Vinyl Derivatives, Zinc & Zinc Compounds

Technical Data Sheet

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Identification & Functionality

Product Type

Features & Benefits

Ready-to-Use Product Features

Applications & Uses

Application Method
Compatible Substrates & Surfaces
Cure Method
Surface Preparation Instructions
  • Scuff the surface with scotch bright pads.
  • Dust off the surface with an air hose and wand.
  • Wipe of the substrate with IPA or Acetone to remove grime and oils
  • Remove all remaining dust and debris by lightly wiping the substrate with a tack or “cheese” cloth
Mixing Instructions

Shake component A in a paint shaker for 5 – 10 minutes for optimal results.
Admix by volume:

  1. Stir or shake both component “A” and “B” well before mixing
  2. Add 4 parts of Component “A” to 1 part of Component “B” by volume and stir thoroughly. Stir each well before mixing.
  3. Reduce with PT-1045. Dilution ratio is 1 part admixed primer to 2 – 3 parts PT-1045.
  4. Mix only an amount that can be used in one day.
Application

This product can be applied using conventional air spray equipment, HVLP spray system. Please consult with a PTI representative for specific equipment recommendations and settings.

  1. Make sure pots, guns, and lines are purged and cleaned.
  2. Mix both base and catalyst thoroughly and filter/strain before spray application.
  3. HVLP Spray Pressure: 7-10psi. Convention spray equipment 15-30psi
  4. Always air-blow and tack wipe the surfaces to be painted. Aircraft should be grounded to prevent static.
  5. Best application results: apply 1 fog/tack coat at 0.2 mil thickness.
  6. Recommended Dry Film Thickness is 0.2 mils.

NOTE: Application of PTI products requires the use of all OSHA approved safety equipment, including proper ventilation. Additionally, PTI products require the recommended temperature/humidity conditions and film thickness ranges for optimal performance. The material, hangar, and aircraft skin temperatures should be no lower than 75⁰ F / 25⁰ C before, during and after application.

Drying and Curing Schedule

Dry times are based on the dry film thickness of 0.2 mils (25-50 microns).

Air Dry: Allow applied coating to dry for at least 15 minutes before painting over it.

Equipment Cleaning

Use clean PTI-1045 Reducer. Do not allow material to dry or cure inside any equipment.

Recommended Reducers

Reducer - PTI-1045 reduce, 1 part paint to 2 – 3 parts reducer

Properties

Typical Properties
ValueUnitsTest Method / Conditions
Admixed Viscosity (max #4 Ford)14.0seconds
Admixed Weight per Gallon11.5lbs.
Coatings VOCmax. 340g/L
Mix Ratio by Volume4 part Base to 1 part Catalyst
Pot Life8.0hours
Recommended Dry Film Thickness0.2mil
Theoretical Coverage1600.0sq. ft./gallon

Regulatory & Compliance

Specifications
  • DOD-P-15328D
  • MIL-C-8514C

Storage & Handling

Shelf Life

Shelf life is only applicable for materials stored in unopened and undamaged original factory filled containers. 1 year when stored between 50°-85° Fahrenheit.