Technical Data Sheet: 4500-P-220Y

Trade Name



Heli-Welders Yellow Epoxy/Polyamide Primer


4500-P-220Y is a fluid and corrosion resistant epoxy/polyamide strontium chromate primer. Designed specifically for the military and aerospace industry?s demanding performance requirements.


  • Excellent adhesion
  • Excellent hydraulic fluid resistance (Skydrol)
  • Excellent lubricating oil resistance
  • Outstanding solvent resistance
  • Superb corrosion resistance

Surface Preparation

Remove all dirt, grease, oil, loose rust, scale or other surface contaminants from the substrate. On ferrous substrates, SSPC 6 Commercial Blasting will enhance the performance of the coating system. If sanding is the preferred method of surface preparation, 100-120 grit paper is recommended to create a surface profile for better adhesion. On aluminum substrates sandblasting, or a suitable etch primer will enhance the performance properties of the primer.

Mixing Instructions

Mix 1:1 by volume Base/Cure. We recommend using a squirrel mixer or equivalent and mix thoroughly for 5 minutes minimum. Allow 15-30 minutes induction time before using. Mix only sufficient material to use within a 8-hour period. Always add Cure component to Base component - NEVER THE REVERSE. Never mix coating or individual component from one vendor with that of another vendor.

Spray Viscosity

17-23 seconds, #2 Zahn Cup

Line Specification

MIL-P-23377F, Type I Class 1


Part NumberDescription

Tempo Aerospace is a AS9100D and ISO9001:2015 certified manufacturer and distributor of high performance polyurethane, epoxy, polysiloxane, lacquer and alkyd coatings.

Our specialty lies in producing made to order batches, ranging from 1 to 300 gallons (4 to 1,100L) in our 25,000 square foot controlled goods certified facility in Toronto, Canada. Custom labelling and packaging in compliance with IATA, IMDG and TDG provides expedited turnaround times for sensitive orders.

Our products are shipped worldwide.

Ship to
60+ Yrs