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Duratec StyroShield
Primer is an air-cure polyester primer that can be applied
directly to polystyrene foam (Styrofoam™). When cured,
StyroShield forms a barrier that allows the use of conventional
polyester laminating resins, tooling putty, or other Duratec
products.
Features
Duratec StyroShield
Primer is the right choice for-
- Making patterns
from low-cost polystyrene foam
- Making prototype
molds, or mold-direct construction
- Anchoring decorative
paints onto polystyrene foam
- Sealing forms
for cast concrete
- Sealing architectural
fixtures
In addition, StyroShield
-
- Contains microspheres,
which provides insulation for polystyrene foam
- Allows polystyrene
foam to be substituted for urethane foam
Mix,
catalyze and use
- Application through
HVLP spray systems or dump guns.
- Tip size of 2.5
mm (100 mil) or larger is recommended.
- Use 15 cc/quart
or liter of Syrgis 925 or a comparable MEKP catalyst
(2% by weight).
- Thorough mixing
is required. Use a drill-driven mixer or paint shaker.
The microspheres will float to the top, and form a hard
crust. The crust can be mixed back into the primer.
- When possible,
store the StyroShield Primer container upside down.
- Topcoat or laminate
over StyroShield when the surface has to cured until
a slight tack remains. No coating should transfer when
the coating is touched.
- Do not add solvent
to the StyroShield Primer. Solvents will attack polystyrene
foam.
- Some rough expanded
polystyrene foams will have deep pits on the surface.
Sealing the pits is necessary to prevent penetration
by resins or topcoats. If pits or voids are observed
after spraying the StyroShield primer, drag a paintbrush,
drywall trowel or metal squeegee across the surface
to force primer into the voids.
- Apply at least
20 mils (450 microns) of StyroShield to the surface
to assure complete coverage and surface protection.
- Clean up with
Acetone or a similar cleaning product.
- Application with
brush or roller is not advised.
Product
Properties (at the time of manufacturing)
All
time calculations are based on temperatures of 77°F,
25°C
Weight per gallon 6 +/- .5 lbs/gal
 Viscosity
at 20 rpm
(As measured on a Brookfield
Viscometer Model RVF, Spindle #2 at 20 rpm) 1800 +/-
600 cps
Thixotropic Index Minimum 4
Gel Time (2% MEKP 925) 30 to 60 minutes
Color Dark Gray Liquid
Cure time (until tacky,
no transfer) at 72° F
and 20 mils film thickness Approximately 2.5 hours
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