Sherwin-Williams CM0482300 Blue Epoxy Fill Primer - Gallon

Composite materials and fiberglass parts should be dry and free of oil, dust, or overspray.

Sherwin-Williams primers are designed to go over various substrate treatments. Before painting, please refer to the recommendations for cleaning, application, and preparation to the manufacturer of the treatment.

Added adhesion properties may be attained by light scuff sanding the surface to be filled. Care must be taken to not breakthrough the protective substrate of the composite or fiberglass material.

Mixing Instructions

Shake primer component for 15 minutes before admixing.

Admix by Volume:
1 Part Epoxy Primer CM0482300
1 Part Epoxy Adduct CM0120900

Add the Epoxy Adduct into the Primer Component. Stir in slowly and allow a 15-minute induction time.

If further reduction is needed, reduce up to 25% by volume with CM0110588 Slow Reducer or CM0702901 Fast Reducer.

It is recommended to filter strain admixed and reduced primer 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

Apply in two or three light coats. Allow each coat to flash off until dull before applying the next coat.

Recommended film thickness is:

Wet: 3-5 mils (75-125 microns)
Dry: 1-1.5 mils (25-38 microns)

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 1.0 – 1.5 mils (25-38 microns).

Air Dry Times (75°F / 25°C, 50% RH)
To Light Sand (220, 240 or 320 grit): 4 hours minimum/24 hours maximum
To apply topcoat: 4 hours minimum/24 hours maximum

Force Dry (140ºF /60ºC, 45% RH)
To Light Sand (220, 240 or 340 grit): 30 Minutes minimum

If topcoat or additional primer is not applied within 24 hours of primer application, light scuff sanding will be required for good adhesion.

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

Guidecoat Colorant to Assist in Sanding (Optional)

To create color contrast when sanding, add up to 0.5 fl. oz. of CM0140968 Surfacer Colorant per gallon of CM0482300 Primer base. Add the colorant to the base prior to admixing. Post adding the colorant to existing mixed material is also acceptable.

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

CM0482300: 2 years