HWFF Styroplast

$29.95 - $85.00
0.00 LBS

Product Overview

Whether you are producing signage or protecting delicate forms for themed scenery, Styroplast will outperform all other coatings. Our one-of-a-kind brush-on encapsulant has a fast set time and clings well to vertical surfaces. It is designed to provide an impact and fire resistant shell for numerous substrates including EPS/Styrofoam, insulative foams, and wood. Our formula is extra thick, as it especially formulated to be the best brush on foam encapsulent.

Can be sprayed too, but spray-on polyurethane coatings require expensive spray equipment and a self contained breathing apparatus. The thickness and fast drying time make it difficult for spraying.

Very little weight is added to the foam structure reducing the need for structural support. Water resistant and chemically inert once cured, it is human and animal safe. Use as a mold or as a surface coating. Superior hardness, fast cycle time, easy to apply, lightweight and short cure time. Environmentally safe once cured. Superior hardness and greater moisture resistance than epoxies.

Coverage: This coating is very strong, even when applied very thin.
1/64" thick, 24 sq/ft
1/32" thick, 12 sq/ft
1/16" thick, 6 sq/ft
1/8" thick, 3 sq/ft
1/4" thick, 1.5 sq/ft

Simple Brush-On Application Tips:
Mix With Part B Warm
Mix EXACT proportions. (See Mixing, below)
Apply in Cool Dry Area
Dry in Warm Humid Area
Apply multiple coats when needed. Best to apply 2-12 hours after each coat is applied.
Easily sanded between coats
Use our Medium Mesh for extra strength, especially in seams and corners.

Material Preparation:

Application in humid conditions may create gas bubbles that rise to the surface during drying. Thoroughly power mix Poly component before beginning to apply. Usually this takes a minimum of 5 minutes per 1 gallon pail with proper mixing equipment. Mix with a slow speed drill and paddle mixer. Hand mixing is fine for small quantities. Mix exact proportions of Part A and B, or the plastic will not harden correctly. We highly recommend using our accessory Syringe for small batches (see the Related Products link at the bottom of the page). An air conditioned room will deliver an ideal low humidity and slow drying environment. Move coated object to a warm area to promote faster drying. Warming Part B to 70-75 degrees before use will make mixing much easier.

Ordinary paintbrush, notched trowel (preferred), or squeegee.
Clean before dry with acetone or MEK.


Potlife (brush): 15 minutes @ 76°F (Up to 30 minutes in cool dry environment)
Potlife (trowel):12 minutes @ 76°F (Up to 20 minutes in cool dry environment)

Cure Time:
Applied coating will set in about 2 to 5 hours at 70°F, depending on film thickness, liquid material temperature and the substrate temperature. Generally complete cure takes from four to five days at room temperature. Product can be placed into service after one complete day of cure at 70°F minimum. After four days cure the hardness is around 65 shore D . Higher hardness may be attained by post heating the part to 90 – 110 F after 6 hours cure time. Prime or paint the plastic coated part the next day, or better, later the same day. If you paint after 12 hours you will need to lightly sand the surface, or better to apply an epoxy primer for paint to stick.

1 unit ISO: 3 units POLY by volume.
Must be very exact proportions. Highly recommend using our reusable accessory measuring Syringe.

1 unit ISO: 3.55 units POLY by weight.

Neutral (tan). Paint within 12 hours or use epoxy primer for best bond. Or just lightly sand after 12 hours for good adhesion.

Fire Resistance:
Styropalst is self-certified as UL-94 V0 at 60 mils thickness.

QUV results indicate that yellowing may be visibly discerned in neutral or off-white in 2 – 3 months continuous exposure. Dark colors such as black may persist for almost a year before oxidative damage may manifest itself as chalking. Physical properties, however, do not typically show significant change for even long periods of time.

Chemical Resistance:
Hydrolytic Stability: Recovers after 10 days 150°F immersion. Generally resistant to most dilute aqueous agents when cleaned off within 10 hours of contact. Very difficult to stain by virtue of its high hardness and low porosity. Constant or frequent immersion service not recommended.

Tensile Properties:
ASTM D-412
Tensile Strength: 2742 psi
Elongation: 9.7 %
Yield Strength: 2653 psi
Elastic Modulus: 17,127 psi
Tear Resistance: ASTM D-624: 156 lb/in
Hardness: ASTM D-2240
Shore D: 65 - 70
Depending upon post cure Conditions.
Impact Resistance:
Unnotched Izod: Untested
Liquid Component Properties:
% Nonvolatile (wt): 100%
Poly Component:
Moderate - High @ 77°F
ISO Component: 200 cps @ 77°
Poly Component: 12.11 lbs/gal
ISO Component: 10.3 lbs/gal
Flash Point: ASTM D-56 (TCC) Greater than 200°F
Toxicity: ISO Component contains isocyanate (the ISO side is has similar health hazards as Gorilla glue). Due to toxicity praying is not recommended. When brushing, ventilation, gloves and protective clothing is required during application

Shelf Life:

The shelf is twelve months for Part B and six months for Part A. They will last longer than that when stored properly.
The ISO, when left open will suck moisture out of the humid air and cause bubbles. The container should be closed when not taking some out.