Sherwin-Williams High Solids Corrosion Resistant Epoxy Primer

To insure proper primer adhesion to the substrate, all contaminates must be removed. Depending on the type of substrate to be prepared, different methods should be used. There are a variety of processes to prepare these substrates for primer and painting.

Sherwin-Williams primers are designed to go over various treatments (i.e., alclad or anodized aluminum, composite, fiberglass, magnesium, and stainless steel). Please refer to recommendations for cleaning, application, and preparation before painting to the manufacturer of the treatment.

If a wash primer is needed, please refer to the Product Data Sheet for CM0484684 Wash Primer.

Mixing Instructions

Shake primer component for 15 minutes before admixing.

Admix by Volume:
2 Parts Epoxy Primer CM0483505
1 Part Curing Agent CM0120506

Add the Curing Agent into the Primer Component.

Admixed product should be allowed a 30-minute induction time for optimum application performance.

Further reduction is not generally necessary. However, if a lower viscosity is needed to meet shop conditions, an additional reduction, a maximum of 10%, with CM0110944 Reducer may be used. This additional reduction may change the application VOC to greater than 2.9 lbs./gal. (350 g/L) depending on the legislation in your area.

It is recommended to filter strain before placing material in containers for spraying.

Application

This product can be applied using conventional air spray HVLP, Graco electrostatic airspray, or air assisted airless. Please consult your Sherwin-Williams representative for specific equipment settings.

Electrostatic users: Ensure that the aircraft is properly grounded for potential static buildup.

Equipment settings:
Conventional air spray:

Air cap atomizing pressure: 50-60 psi (3.45-4.15 bar)
Pot pressure: 10-12 psi (0.69 – 0.83 bar) using a 60’ fluid hose (3/8” diameter)
Delivery Rate: 8-10 fluid oz (236-295 mL) per minute

Best spray application results are obtained by applying one light continuous closed film cross coat.

Recommended dry film thickness is 0.6 – 0.9 mils (15-23 microns).

Surfacer primer can be applied after a MINIMUM two-hour cure to allow time for solvent flash-off. Thicker mil films or cooler conditions will extend the solvent flash time. Please refer to the Product Data Sheets CM0480920 Epoxy Surfacer or CM0481810 Urethane Surfacer for more details.

NOTE: Application of these product systems requires recommended temperature / humidity conditions and film thickness ranges. The material, hangar, and aircraft skin temperature should be no lower than 55ºF / 13ºC before, during, and after application.

Drying Schedule

Dry times are based on the dry film thickness of 0.6-0.9 mils (15-23 microns).

Air Dry Times (75°F / 25°C and 50% RH)
To apply topcoat: 2 hours minimum/72 hours maximum
Tack free: 5 hours minimum
Dry Hard: 8 hours minimum

Force Dry: (140ºF (60ºC), 45% RH
To apply topcoat: 1 Hour

*If an intermediate primer of topcoat is not applied within 72 hours of primer application, light scuff sanding using P240, P320 paper &/or red abrasive pad will be required for good intercoat adhesion.

NOTE: Lower temperatures, heavy film thickness, improper activator range selection and poor air movement will extend the dry time.

Equipment Cleanup

Use clean Ketone–type solvents such as CM0110308 MEK. Do not allow material to cure inside equipment.

Shelf Life

Shelf Life is applicable only for materials stored in unopened and undamaged original factory filled containers.

Minimum Storage Temp: 40ºF / 4ºC
Maximum Storage Temp: 100ºF / 37ºC

CM0483505: 2 years
CM0120506: 2 years
CM0110944: 7 years

Aerosol Touch–Up Kits: 1 year

Cool, Dry Storage Required.