Stits Epoxy Primer Kits Green EP-420 / EP-430 / E-500

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Quart Kit (Yields 2.5 Qts)Gallon Kit (Yields 2.5 Gallons)
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**Note: Quart Kit is pictured**

This green heavy duty chemical and solvent resistant amine cured primer from Stits is fast drying and corrosion inhibiting. It can be applied and cured to temperatures down to 35F. Mixing ratio is 2 parts base, 1 part catalyst.

Catalyst use: An amine resin in a solvent blend for use in EP-420 Epoxy Primer according to directions on the base component listing. Mixing ratio is 2 parts base, 1 part catalyst.

Reducer use: A blend of solvents for use in EP-420 Epoxy Primer according to the directions in the base component listing. Reduce 50%.

Stits Epoxy Primer Kit Green includes EP-420 Epoxy Primer, EP-430 Epoxy Primer Catalyst, and E-500 Epoxy Reducer. Available in quart or gallon sized kits.

Important Notice: All mixed paints are special order and are non-returnable.
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Awesome stuff! I thinned my second batch a tiny bit more and it gave a beautiful smooth (primer) finish.

Richard G Verified Purchase


February 23, 2024

I have used this for many years, most important is metal prep or it will not stay stuck.

Brian E Verified Purchase


November 1, 2022

Im sure the product was in good shape at time of shipping and due to the way it was packaged three out of the four containers were damaged from being dropped. I had to transfer liquid to other containers so to avoid leaking.

October 13, 2018


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: What is the pot life for this epoxy green primer? Does it age and crack?

The maximum pot life of the epoxy green primer is 7 hours at 70 degrees F. Discard materials when viscosity increases or becomes stringy between the fingers. There is no tech data sheet that says if it ages or cracks but this particular epoxy primer will not shrink like a polyester primer would.

Q: What does the gallon kit of Stits Epoxy Primer actually consist of? It does not give the sizes of the base, catalyst, and reducer in the description.

The kit components are as follows:

  • 1 x Part # 09-05610: STITS # EP-420 GREEN GALLON
  • 2 x Part # 09-05620: EP-430 EPOXY CATALYST QUART
  • 1 x Part # 09-01108: E-500 EPOXY REDUCER GALLON

Q: Can you apply this over [or to seal] zinc chromate on older plane frames to ensure youre compatible with the Poly-Fiber polyester products?

The answer is yes. All one needs to do is (clean, waiting long enough for the surface to dry) scuff and shoot.

Q: Is this considered polyepoxamide primer?

Yes, but that it is not structural in nature.

Q: Can you confirm that Stits epoxy primer does not contain polyisocyanides and it can be safely sprayed with a quality filtered respirator?

Epoxy primer does NOT contain any isocyanates and it can be sprayed with a cartridge respirator that has organic vapor cartridges.

Q: What is the color shade of the green primer?

Dark green in color.

Q: For the green primer, what is the green ral number?

RAL 6003

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