Imperiflex 640 is a transparent high-gloss lacquer formulated specifically for flexible materials: urethane rubbers, foams and EVA foam. Its two-component formulation with thinner provides a finish that flexes with the substrate without cracking, making it the go-to option for props, cosplay and scenic pieces that need a hard, glossy and durable finish on surfaces that bend or compress.
Technical specifications
Parameter
Value
Format
1/2 Gallon Kit — 1.89 Lt total
Kit composition
1 can Clear (quart) + 1 can Thinner (pint) + 1 can Hardener (pint)
Mix ratio (by volume)
2 parts Clear : 1 part Thinner : 1 part Hardener
Finish
Transparent gloss
Flexibility
High — does not crack on flexible substrates
Recommended use
Professional / semi-professional
Compatible substrates
Urethane rubbers, urethane foams, EVA foam
What it is used for
Imperiflex 640 acts as a finishing lacquer, sealing base coat and final protective layer on flexible materials. Its main advantage is that it maintains the flexibility of the substrate, so it does not peel or crack when the piece is bent or subjected to impact. It is especially useful as a base coat before applying metallic pigments or as a final sealing layer to protect chrome finishes.
Flexible gloss finish on foam or rubber cosplay props and armour
Sealing EVA foam pieces before painting or chroming
Transparent base coat for cold chrome systems on flexible substrates
Final sealing layer over Alumaluster to protect the metallic finish
Theatrical and film scenic pieces with parts that require movement
Finishing masks, helmets and flexible urethane accessories
Durable protection on prop pieces subject to frequent handling
How to use it
Prepare the surface: Make sure the substrate is clean, dry and free of dust, grease or release agent residue. If the piece is made of urethane rubber or foam, lightly sand with fine-grit sandpaper to improve adhesion.
Get a glossy black base: To maximise the gloss effect, first apply a coat of gloss black paint or work directly with a glossy black rubber piece. This enhances the depth of the final finish.
Measure and mix: In a clean container, mix by volume: 2 parts Clear + 1 part Thinner + 1 part Hardener. Mix thoroughly for at least one minute until a homogeneous mixture is obtained.
Apply the first coat: Apply Imperiflex with a spray gun, airbrush or short-bristle brush in thin, even coats. Allow to dry between coats according to ambient conditions.
Intermediate coats (chrome system): If you are looking for a chrome finish, apply a transparent Imperiflex base coat, then apply Alumaluster for the metallic effect and finish with one or two coats of Imperiflex as a protective seal.
Optional tints: In the final sealing coat you can add alcohol-based dyes to modify the chrome tone (gold, copper, titanium, etc.) without losing transparency.
Curing time: Allow the piece to fully cure before handling or subjecting it to intense flexing. Time varies depending on ambient temperature and humidity.
Professional use — Read the safety data sheet before use. Imperiflex 640 contains isocyanates and organic solvents. Always work in a well-ventilated space or with localised extraction. Use a respirator with an organic vapour filter, nitrile gloves and safety goggles. Avoid inhaling vapours and contact with skin and eyes. Keep away from heat sources and flames. Consult the safety data sheet before each use.
Usage tips
The glossy black base makes all the difference
The final gloss level of Imperiflex depends largely on the surface it is applied to. A glossy black base — whether the natural colour of the urethane rubber or a coat of mirror-finish black paint — multiplies the depth and intensity of the final finish. If you apply Imperiflex over a matte or porous surface without prior preparation, the result will be noticeably duller.
Correct dilution and application temperature
Always respect the 2:1:1 ratio by volume. A mix with too much hardener can produce a brittle finish that cracks when the substrate flexes. If you are working in a cold environment (below 18 °C), curing time increases considerably; above 25 °C, the activated mix has less working time, so prepare only the amount you will use in 20–30 minutes. For spray gun applications, test the viscosity on a test piece before tackling the final piece.
Layer order in flexible chrome systems
To achieve flexible chromed surfaces with maximum durability, follow this order: first coat of transparent Imperiflex as a seal and base coat (improves chrome adhesion), then Alumaluster for the metallic effect, and finally one or two coats of Imperiflex as a protective top coat. In this final coat you can incorporate alcohol-based dyes to achieve gold, copper or titanium finishes without losing transparency or flexibility.
Frequently asked questions
Can it be applied over any foam?
Imperiflex 640 is formulated for urethane foams and EVA foam. On other types of foam (expanded polystyrene, for example) the solvents it contains may attack the substrate. Always do a test on a small piece before applying it to the final piece.
Do you need a spray gun or can it be applied with a brush?
Imperiflex 640 can be applied with a spray gun, airbrush or short-bristle brush. A spray gun or airbrush gives the most uniform and glossy finish. Application with a brush is possible, but there is a greater risk of application marks; in that case apply very thin coats and cross the strokes to minimise marks.
How many coats are needed for a good result?
For a basic sealing finish over foam or EVA foam, two or three thin coats are sufficient. If you use Imperiflex as both a base coat and a top coat in a chrome system, at least two base coats and two final sealing coats are recommended for durable protection and optimum gloss.
How long do I have to work with the mix once activated?
Once the three parts are mixed, the pot life is limited and varies depending on ambient temperature. Under normal conditions (20–22 °C) you have approximately 20–30 minutes of working time before viscosity starts to increase. Prepare only the amount you will apply in each session.
Can it be tinted to obtain coloured finishes?
Yes. You can add alcohol-based dyes to the Imperiflex coat to modify the tone of the finish. This is especially useful in the final sealing coat over Alumaluster to achieve gold, copper, blue-tinted or any other metallic tone without losing transparency or flexibility.
What is the difference between the 1/2 gallon kit and the quart kit?
The difference is the total volume of product. The 1/2 gallon kit (this product, 1.89 Lt) includes 1 can of Clear (quart), 1 can of Thinner (pint) and 1 can of Hardener (pint). The Quart kit (946 ml) includes the same parts in a smaller format. The 2:1:1 mix ratio is the same across all kits.
Does the finish crack if the piece is bent repeatedly?
No, as long as the correct mix ratio is respected and application is done in thin coats. Imperiflex 640 is specifically formulated to maintain flexibility on substrates such as urethane rubbers and foams without cracking under flexing. Excess hardener or excessively thick coats can reduce that flexibility.
Is special protection needed to apply it?
Yes. Imperiflex 640 contains isocyanates and solvents. It is essential to use a respirator with an organic vapour filter (a dust mask is not sufficient), nitrile gloves and safety goggles. Always work in a well-ventilated space or with localised extraction. Consult the safety data sheet before first use.
Video tutorial
How to Paint Urethane Rubber | Cosplay Armor | Full Breakdown
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