TRUCAST™ Powder, Defoamer & Surface Refining Admix

Reduce Entrapped Air. Refine Every Surface.

TruCast™ Defoamer & Surface Refining Admix is a premium powdered air-release admixture designed to reduce entrapped air, minimize surface defects, and improve the overall appearance of precision cast concrete. Formulated for use in GFRC, UHPC, ECC, mortar-based castings, and other high-performance cementitious systems, TruCast helps fabricators achieve smoother, denser, and more consistent finished surfaces.

During mixing, microscopic air bubbles can become trapped within cementitious materials. These air voids often appear as pinholes, bugholes, surface blemishes, and other cosmetic imperfections after demolding. TruCast Defoamer & Surface Refining Admix works by promoting the release of unwanted entrapped air during mixing, placement, and consolidation, helping produce cleaner castings with improved surface quality.

Whether you are producing concrete countertops, sinks, furniture, fireplace surrounds, architectural panels, planters, decorative concrete elements, or other precision cast concrete products, TruCast helps elevate the appearance of the finished piece while reducing time spent filling and repairing surface defects.

Key Benefits

• Reduces entrapped air within cementitious mixes

• Minimizes pinholes, bugholes, and surface voids

• Improves cast surface appearance and consistency

• Helps create a tighter, more refined concrete matrix

• Enhances mold reproduction and surface detail

• Compatible with GFRC, UHPC, ECC, and precision cast concrete mixes

• Easy-to-use powdered format for dry blend systems

• Ideal for both hand-cast and spray-applied applications

• Helps reduce post-casting surface repair and touch-up work

Applications

TruCast Defoamer & Surface Refining Admix is suitable for a wide range of precision cast concrete applications including:

• Concrete countertops

• Concrete sinks

• Furniture and tables

• Fireplace surrounds

• Architectural wall panels

• GFRC castings

• UHPC castings

• Decorative concrete products

• Custom precast concrete components

• Artisan concrete fabrication

• Specialty cement-based castings

Why Entrapped Air Matters

Entrapped air is one of the leading causes of surface defects in cast concrete. As air bubbles become trapped within the mix, they can migrate toward the mold surface and leave behind pinholes, bugholes, and other blemishes once the casting is demolded.

By improving air release during mixing and placement, TruCast Defoamer & Surface Refining Admix helps produce cleaner surfaces with greater visual consistency. The result is improved mold detail reproduction, reduced patching and surface refinishing, and a more professional finished appearance.

Designed for Precision Cast Concrete

At Fishstone, we define Precision Cast Concrete as the fabrication of highly detailed concrete products where appearance, dimensional accuracy, surface quality, and consistency are critical. This includes concrete countertops, sinks, furniture, architectural panels, fireplace surrounds, planters, custom precast components, and specialty cast concrete products.

TruCast Defoamer & Surface Refining Admix was developed specifically to support these demanding applications by helping fabricators achieve cleaner, more refined cast surfaces with fewer defects and less post-cast repair work.

Recommended Dosage

TruCast™ Defoamer & Surface Refining Admix can be dosed at 0.1% to 1.0% by weight of total cementitious materials, depending on mix design, mixing intensity, desired surface quality, and the amount of entrapped air present.

Typical Starting Dosage:

• 0.2% to 0.5% of total cementitious materials by weight

Example:
For a mix containing 50 lbs of total cementitious materials (cement, pozzolans, and other reactive binders), a dosage of 0.25% would equal approximately 0.125 lbs (2 ounces or 57 grams) of TruCast Defoamer & Surface Refining Admix.

Dosage Guidelines

• Lower dosages may be suitable for dense, highly flowable mixes with minimal entrapped air.

• Higher dosages may be beneficial in mixes prone to pinholes, bugholes, or excessive air entrainment.

• Excessive dosage may affect workability or alter the air content beyond what is desirable for a specific application.

• Always conduct trial batches when introducing any admixture into a new mix design.

Mixing Instructions

For best results, add TruCast Defoamer & Surface Refining Admix directly to the dry ingredients and blend thoroughly before adding water or liquid polymers. Proper dispersion throughout the mix is essential for optimal performance.

Because raw materials, mixing equipment, and production methods vary, users should establish the optimum dosage through testing under actual production conditions.

Compatibility

TruCast Defoamer & Surface Refining Admix is compatible with most Portland cement-based systems, including mixes containing polymers, pozzolans, fibers, pigments, and other common concrete admixtures. Testing is always recommended when introducing any admixture into a new mix design.

Technical Facts

Product Type: Powdered Air-Release & Surface Refining Admixture

Primary Function: Reduce Entrapped Air and Surface Defects

Benefits: Fewer Pinholes, Fewer Bugholes, Improved Surface Quality

Compatible With: GFRC, UHPC, ECC, Mortar Mixes, and Portland Cement-Based Systems

Applications: Precision Cast Concrete

Form: Free-Flowing Powder

Packaging: Available in Multiple Sizes

Frequently Asked Questions

What does TruCast Defoamer & Surface Refining Admix do?

TruCast helps reduce entrapped air within cementitious mixes. By promoting air release during mixing and placement, it helps minimize pinholes, bugholes, and other surface defects while producing cleaner, more refined cast surfaces.

What types of concrete can TruCast be used in?

TruCast is suitable for GFRC, UHPC, ECC, mortar-based mixes, architectural precast, concrete countertops, concrete sinks, furniture, fireplace surrounds, and other precision cast concrete applications.

Will TruCast eliminate all pinholes?

No admixture can completely eliminate pinholes under every condition. Surface quality is influenced by mix design, water content, consolidation methods, mold quality, vibration practices, and curing conditions. However, TruCast can significantly reduce entrapped air and help improve overall surface appearance.

Does TruCast improve concrete strength?

TruCast is primarily designed to reduce entrapped air and improve surface quality. By reducing unwanted air voids, it may contribute to a denser concrete matrix, but it is not intended to function as a strength-enhancing admixture.

Can TruCast be used with polymers?

Yes. TruCast is generally compatible with most acrylic, styrene acrylic, and other commonly used concrete polymers. Trial batching is always recommended when introducing any admixture into a mix design.

Can TruCast be used with pigments?

Yes. TruCast is compatible with most integral concrete pigments and color systems commonly used in decorative, architectural, and precision cast concrete applications.

Can TruCast be used with fibers?

Yes. TruCast can be used in mixes containing AR glass fibers, PVA fibers, polypropylene fibers, carbon reinforcement, and other common reinforcement systems.

What is Precision Cast Concrete?

Precision Cast Concrete refers to highly detailed concrete products where appearance, dimensional accuracy, surface quality, and consistency are critical. Examples include concrete countertops, sinks, furniture, architectural panels, fireplace surrounds, planters, custom precast components, and specialty cast concrete products.

How is a powdered defoamer different from a liquid defoamer?

Powdered defoamers are often preferred in dry-blend formulations because they can be incorporated directly into bag mixes and powdered admixture systems. Liquid defoamers may provide additional flexibility during batching and mix adjustments. Selection depends on the application, production process, and user preference.

Professional Results Start in the Mix

Surface quality is determined long before a casting is removed from the mold. TruCast Defoamer & Surface Refining Admix helps fabricators take control of entrapped air and surface refinement at the source, producing smoother, cleaner, and more consistent precision cast concrete.