Sherwin-Williams CM0560566 High Build Epoxy Sanding Primer - Gallon

This intermediate, two-component epoxy surfacer is intended for use on aircraft and other aerospace applications over Sherwin-Williams corrosion protective primers. It is designed to insure maximum corrosion and aviation fluid resistance while providing a high build sandable surface that enhances topcoat appearance.

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

CM0560566: 2 years
CM0110588: 7 years
CM0120888: 2 years
CM0702901: 7 years
CM0140968 2 years

Surface Preparation

Surface should be dry and free of oil, dust, or overspray. For maximum adhesion and corrosion resistance, apply over a corrosion resistant primer such as CM0483928, CM0483505 or CM0483660, which has previously been properly treated or wash primed with CM0484684.

The CM0560566 should be applied over the selected corrosion preventative primer within 4 hours at 77ºF (25ºC). If overnight cured, a light scuff sanding (320 grit sandpaper or Scotchbrite 7447) and cleaning is recommended.

NOTE: Do not use this product as a filler Surfacer to cover marginally prepared composite/fiberglass or polyester filler bondtite area. Address these appearance items by reviewing the cured corrosion protective primer and assuring satisfactory smoothness before applying CM0560566.

Mixing Instructions

Shake primer component for 15 minutes before admixing.

Admix by Volume:
1 Part Epoxy Primer Component CM0560566
1 Part Epoxy Adduct CM0120888

Add the Adduct into the Primer Component.

Admixed product should be allowed a 15-minute induction time for optimum application performance.

If a lower viscosity is needed, use up to 1 - 1½ quart per 2-gallon kit of CM0110588 Slow Reducer, CM0702901 Fast Reducer or a blend of both products depending on your shop conditions.

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: 40-50 psi (2.75-3.45 bar)
Pot pressure: 8-12 psi (0.55 – 0.83 bar) using a 60’ fluid hose (3/8” diameter)
Delivery Rate: 8-10 fluid oz (236-295 mL) per minute

Apply CM0560566 using a wet medium cross coat method. Apply in two coats with a 45-minute solvent flash-off time between coats.

Recommended final dry film thickness is 1.0 – 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 and 50% RH)
To Light Sand (220, 240 or 320 grit): 1 hour minimum
To DA (Orbital) Sand: Overnight Minimum
To Topcoat (after sanding): 8-12 hours minimum

Force Dry (150ºF (60ºC), 50% RH
To Light Sand (220, 240 or 320 grit): 30 minutes minimum

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

Sanding Recommendations

CM0560566 must be sanded to a smooth surface prior to topcoating. Mechanical DA (orbital) sanding or hand sanding of this product works well with 220, 240 or 320 grit sandpaper. Proper sanding is the key to good intercoat adhesion and a smooth appearing surface.

NOTE: If the cured epoxy primer is inadvertently sanded through, a spot repair will be required prior to spraying topcoat.

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 CM0560566 Primer base. Add the colorant to the base prior to admixing. Post adding the colorant to existing mixed material is also acceptable.

Equipment Cleanup

Flush and clean fluid material hose and paint guns as soon as possible after spraying is complete. Use clean Ketone–type solvents such as CM0110308 MEK. Do not allow material to cure inside equipment.