Duratec SunShield Clear Polyester Topcoat 904-061 with MEKP

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Duratec

Duratec SunShield Clear Polyester Topcoat 904-061 with MEKP

SKU:DURA-SS061Q

Brand Duratec Part No. 904-061

$84.95 USD

$84.95 USD ~~USD~~

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Size: Quart with Catalyst

Quart with Catalyst Gallon with Catalyst

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Duratec SunShield (904-061) is a clear polyester topcoat that resists yellowing in sunlight, so exterior carbon fiber and fiberglass parts can be clear coated without a sun-blocking urethane over the top. It is easy to sand and polishes to a wet-look gloss.

Use it three ways. Spray it over a finished part as the clear coat, spray it into the mold first and laminate behind it, or spray it wet on wet over fresh unwaxed polyester gelcoat as a gloss, UV-protective layer that lets the gelcoat cure with no wax or PVA. It is pre-promoted and air cures with no wax. Typical jobs are exterior carbon fiber parts, exterior fiberglass parts, marine work above the waterline and outdoor wood furniture.

Catalyze at 2% MEKP by weight and mix only what you will use in about 12 minutes. Spray with an HVLP gun through a 1.8 to 2.2 mm tip at 34 to 40 psi. Start with a light dust coat, wait two minutes, then build 4 to 5 mil per coat. Twelve mil gives a good finish with UV protection, and up to 22 mil can go on if the part needs heavy sanding afterward.

Over a cured epoxy laminate, wash the surface with clean water and a scrub pad before and after sanding, and sand with 180 grit for tooth. In the mold, use a wax release, and let the SunShield reach tack free before an epoxy layup. Polyester and vinyl ester can go on while it still has some tack. Test the bond with your own epoxy first.

Both sizes ship with MEKP catalyst. The shop and the part need to be at 64 F or warmer.

Specifications

ColorClear

Part Number904-061

Product TypeClear polyester topcoat, air cure, UV resistant

CatalystMEKP at 2% by weight; included

Gel Time15 to 18 minutes at 77 F, 100 g mass catalyzed at 2% MEKP

Working WindowCatalyze only what will be used in about 12 minutes

Viscosity540 to 800 cps, Brookfield RVF at 20 rpm

Thixotropic Index3.0 minimum

Weight per GallonAbout 8.84 lb

CoverageAbout 80 sq ft per gallon at 20 mil thickness

AppearanceClear, with a slight hue in the can

Film Build4 to 5 mil per coat after a dust coat; 12 mil for a UV-protective finish, up to 22 mil

Spray Tip1.8 to 2.2 mm, HVLP gun

Spray Pressure34 to 40 psi at the gun

Minimum Application Temperature64 F, product and part

ThinningUsually none. Try a larger tip first, then Duratec reducer. No acetone

Over Fresh GelcoatWet on wet over unwaxed polyester gelcoat, 8 mil minimum in 2 to 3 passes

PolishingSand, then wait 8 hours before the final polish

In-Mold ReleaseWax mold release

Marine UseAbove the waterline

Shelf Life6 months from the manufacture date on the can, unopened, with proper storage

SizesQuart and gallon, each with MEKP catalyst

Includes

Duratec 904-061 SunShield Clear Polyester Topcoat, 1 quart or 1 gallon by the size selected
MEKP catalyst

Features

Resists yellowing in sunlight, with no sun-blocking urethane needed for exterior use
Clear coat for exterior carbon fiber and fiberglass parts
Sprays on finished parts, in the mold before layup, or wet on wet over unwaxed gelcoat
Pre-promoted and air cure, no wax required
Easy to sand, polishes to a wet-look gloss
Good chemical resistance, flexibility and impact resistance
MEKP catalyst included with both sizes

View full details

Duratec SunShield spray setup: 2% MEKP, 1.8 to 2.2 mm tip, 12 to 22 mil build, 80 sq ft per gallon at 20 mil

Can Duratec SunShield go over epoxy and carbon fiber?

Yes. On a cured epoxy laminate, wash the surface with clean water and a heavy duty scrub pad before and after sanding, sand the whole surface with 180 grit, remove the dust and wipe with acetone, then spray.

Polyester and vinyl ester laminates do not need the water wash.

Can I spray SunShield in the mold instead of on the finished part?

Yes. Start with a light dust coat, let it set for two minutes, then build 4 to 5 mil per coat. Laminate polyester or vinyl ester when the SunShield has set up but still has some tack.

For an epoxy layup the SunShield has to be tack free first, and the bond comes from the epoxy, so test it with your resin before a real part.

What mold release works with SunShield in the mold?

Use a silicone free paste wax release. A wax release, used alone or together with a semi-permanent release, gives the surface tension SunShield needs to level and flow across the mold.

How thick should SunShield be applied?

Twelve mil gives a good finish with UV protection. Up to 22 mil can be applied when the part will need aggressive sanding afterward. Build it 4 to 5 mil per coat with at least two minutes between coats.

Can SunShield be brushed or rolled?

It is made to spray, with an HVLP gun and a 1.8 to 2.2 mm tip. Brushing or rolling is for topcoating wood.

Can SunShield go over fresh gelcoat?

Yes. It can be sprayed wet on wet over unwaxed polyester gelcoat, right away or up to 12 hours after the gelcoat goes on. Spray at least 8 mil in 2 to 3 passes. The SunShield air cures and seals the surface, so the gelcoat needs no wax or PVA.

If about a day has passed, sand the gelcoat lightly first. Wet on wet is not for epoxy or urethane coated surfaces.

Can it be used below the waterline?

The manufacturer lists marine use above the waterline only.

Is there a data sheet and application guide?

Yes. The technical data sheet covers the properties, all three application methods and a troubleshooting table. The safety data sheet is linked under it.

Technical Data Sheet and Application Guide (PDF)

Safety Data Sheet (PDF)