About GREOS

Pioneering the Future of High-Temperature Aerospace Coatings.

We're eliminating the compromises aerospace engineers have been forced to make for decades in extreme heat environments.

Our Mission
"We're eliminating the compromises aerospace engineers have been forced to make for decades in extreme heat environments."
— GREOS

The problem we solve

Airframers are forced to compromise with brittle silicones, heavy ceramics, or bare metal in hot zones.

GREOS coatings deliver what no one else can — an elastomeric, fuel-resistant, sprayable coating that survives 350°C / 660°F+. We extend coating life, reduce weight, and open design freedom for the next generation of aerospace and defense platforms.

Modern platforms are demanding more from their surface protection than any existing coating was engineered to provide. Every year that gap widens. GREOS closes it.

Why thermal demands are accelerating

  • Advanced engine technologies generating higher exhaust temperatures than any previous generation
  • Electric propulsion systems concentrating thermal loads in compact motor and battery enclosures
  • Hypersonic flight regimes creating aerodynamic surface heating that destroys conventional coatings
  • Next-generation military aircraft and directed-energy systems pushing material science to its limits

Leadership team

Built by Engineers Who Know the Mission.

GREOS was founded and led by veterans of aerospace materials and advanced chemistry — people who have spent careers building solutions for the problems GREOS was created to solve.

Andrew Sundsmo
Andrew Sundsmo
Founder & President
LinkedIn
  • Founded and led MAST Technologies (2009–2024), a San Diego designer and manufacturer of radar absorbing materials and advanced materials for aerospace and defense
  • Scaled MAST from concept to profitable operation through a successful exit in 2020 — leading strategy, product development, and customer acquisition
  • 15+ years solving complex materials engineering challenges for defense and aerospace with custom-tailored electrical and mechanical properties
  • BS in Managerial Economics, UC Davis — recognized for product development expertise and translating technical innovation into market solutions
Garrett Garner, Ph.D.
Garrett Garner, Ph.D.
Director of Advanced Materials & Coatings
LinkedIn
  • Pioneers next-generation high-temperature elastomeric coatings delivering unmatched flexibility, durability, and performance in extreme aerospace environments
  • 20+ years of expertise in advanced materials innovation, precision instrumentation, and high-impact commercialization
  • Ph.D. in Synthetic Organic Chemistry, Purdue University — research in Nobel Laureate H.C. Brown's Boron Research Center; advanced coursework with Nobel Laureate Ei-ichi Negishi
  • Founded and scaled the Molecular Diagnostics Engineering unit at Sekisui Diagnostics; secured multiple FDA 510(k) clearances under rigorous regulatory frameworks

Our approach

Advanced Chemistry Meets Aerospace-Grade Engineering.

GREOS leverages fluoroelastomer (FKM) and perfluoroelastomer (FFKM) chemistries — materials proven in demanding industrial applications — and adapts them for aerospace coating requirements in a sprayable format that didn't previously exist.

Materials Innovation
FKM and FFKM fluoroelastomer chemistries — proven in high-performance seals for decades — reformulated as sprayable aerospace topcoats. A capability that has never existed before.
Tiered Solutions
A three-tier product architecture lets customers select the right temperature capability and cost point — from 250°C / 480°F commercial applications to 350°C / 660°F+ hypersonic platforms.
Aerospace Standards
All formulations are designed to meet or exceed ASTM, MIL-STD, RTCA, and industry specifications for thermal cycling, adhesion, chemical resistance, and appearance.
Elastomeric Performance
Maintains flexibility and vibration resistance at elevated temperatures — reducing stress cracking and delamination that defeats rigid alternatives
Chemical Resistance
FKM/FFKM chemistry provides excellent resistance to fuels, hydraulic fluids, de-icing agents, and solvents throughout the service life
Spray Application
Formulated for conventional spray equipment — enabling integration into existing OEM and MRO finishing workflows with no process changes
Environmental Compliance
CARB-exempt solvent systems, low-VOC formulations, and non-PFAS dispersants ensure regulatory compliance without performance compromise

Designed for real-world aerospace

Every Formulation Reflects How Aerospace Actually Works.

GREOS coatings are developed with the realities of aerospace manufacturing and maintenance in mind — not just what performs in the lab, but what integrates into actual qualification programs, finishing workflows, and depot operations.

From qualification-ready test method reference suites to CICP pigments that maintain color consistency across platforms and maintenance cycles, every design decision reflects what aerospace engineers actually need.

Qualification-Ready
Designed to meet ASTM D412, D4541, D573, RTCA DO-160G, MIL-STD-3034, and aerospace fluid resistance standards
Color Matching
High-temperature stable CICP pigments enable color coordination across platforms and maintenance consistency at depot
Weight Conscious
Thin-film application replacing heavy metal shields delivers measurable weight savings on airframes and rotary-wing platforms
Maintenance Efficiency
Extended service intervals reduce downtime and total cost of ownership for operators — 3–5× vs conventional topcoat alternatives

Engineered for what's next

Built for Today's Requirements. Ready for Tomorrow's.

As aerospace evolves toward hypersonics, electric propulsion, directed energy systems, and next-generation air dominance platforms, thermal challenges will only intensify. GREOS coatings are engineered not just for today's requirements, but for the extreme environments of tomorrow's aerospace systems.

The three-tier product architecture scales from commercial MRO today to hypersonic weapon systems tomorrow — one coating platform, every thermal environment.

HypersonicsNGADeVTOL / AAMDirected EnergySpace & LaunchCommercial Aviation
Technical Excellence
Rigorous testing and validation against aerospace standards ensures every formulation meets the demanding requirements of flight-critical applications.
Partnership Approach
Close collaboration with OEMs, MROs, and research institutions to understand real-world challenges and co-develop solutions that deliver measurable value.
Sustainability
CARB-compliant formulations, low-VOC solvents, and non-PFAS chemistries that meet environmental regulations without compromising performance.

Discover How GREOS Coatings Can Reduce Weight and Enable Next-Gen Designs.

Request technical datasheets or schedule a consultation with the GREOS application engineering team to explore the right coating solution for your platform.