What Are the UHPC Surface Treatment Processes? Differences Between Fair-Faced Finish, Spray Paint, and Fluorocarbon Paint?

# A Complete Guide to UHPC Surface Treatment Processes: How to Choose Among Fair-Faced Finish, Spray Paint, and Fluorocarbon Paint In the practical application of UHPC (Ultra-High Performance Concrete) curtain walls and decorative components, the surface treatment process directly determines the finished product's appearance, texture, weathering lifespan, and applicable scenarios. It is also the aspect most easily confused by many building owners during early-stage project selection. As a professional intelligent manufacturing service provider with nearly 30 years of deep expertise in the UHPC field, we draw on the implementation experience of nearly 1,000 domestic and overseas projects to systematically sort out the characteristics, differences, and selection logic of three mainstream UHPC surface treatment processes, helping you avoid selection pitfalls. ## I. Core Characteristics of the Three Mainstream UHPC Surface Treatment Processes ### 1. UHPC Fair-Faced Finish Treatment The fair-faced finish is UHPC's most iconic original surface treatment solution. Its core lies in retaining UHPC's inherent dense texture and fine grain through optimized raw material ratios, controlled pouring processes, and later-stage fine polishing. With mature processes, the air bubble defect rate of UHPC fair-faced finished products can be controlled within 0.3%, presenting a uniform matte stone-like texture without any additional coating, perfectly suited to minimalist and industrial-style public building facade designs. This process places extremely high demands on production quality control—raw material ratios, vibration parameters during pouring, and the temperature and humidity of the curing environment all directly affect the uniformity of the final product. ### 2. UHPC Spray Paint Treatment UHPC spray paint treatment is a basic surface coloring solution, generally spraying a single-component or two-component colored coating onto the surface of prefabricated UHPC components to achieve unified custom colors. The advantages of this process are flexible color changes, low construction costs, and short delivery cycles. However, the coating thickness is usually at the tens-of-microns level, with limited UV and abrasion resistance, making it more suitable for indoor decorative components and short-term display projects. It is not recommended for long-term exposure to outdoor conditions with strong sunlight and high corrosion. ### 3. UHPC Fluorocarbon Paint Treatment Fluorocarbon paint treatment is currently the most commonly used high-performance surface treatment solution for outdoor UHPC components. The coating uses fluororesin as the main film-forming substance, typically applied in a three-coat or even four-coat process, with a total coating thickness of over 200 microns. It offers extremely strong resistance to UV aging, acid and alkali corrosion, weathering, and staining, with a color retention lifespan of over 15 years under normal outdoor conditions. It can also achieve various customized color effects such as metallic, matte, and high-gloss finishes, meeting the demanding facade requirements of landmark buildings and cultural tourism projects. ## II. Comparison of the Core Differences Among the Three Processes In terms of applicable scenarios, the UHPC fair-faced finish focuses more on restoring the original texture, suitable for projects that need to express the material's inherent qualities, such as art museums and public cultural buildings in the style of Tadao Ando; spray paint treatment is only suitable for indoor decorative scenarios not intended for long-term use, and can be chosen for small indoor projects that are cost-sensitive with no long-term weathering requirements; fluorocarbon paint treatment is the universal choice for outdoor UHPC projects, and its performance advantages are even more prominent under special conditions such as the high temperatures and heavy rains of South China and coastal salt-fog corrosion. In terms of cost, the three processes show a clear cost gradient: spray paint treatment has the lowest unit cost; fair-faced finish treatment demands high production quality control and falls in the middle; fluorocarbon paint treatment is relatively the most expensive due to the higher complexity of coating materials and construction processes. In terms of construction and maintenance, fair-faced finish treatment requires only routine surface cleaning afterward, with no risk of coating peeling or fading; spray paint treatment generally shows varying degrees of fading and peeling within 3-5 years and needs re-spraying for maintenance; fluorocarbon paint treatment has the longest maintenance cycle, typically requiring only one surface condition inspection every 10-15 years, with extremely low later-stage maintenance costs. ## III. Tips for Avoiding Pitfalls in UHPC Surface Treatment Selection Many project owners easily fall into the misconception that "the more expensive, the better" when making selections. In reality, there is no absolutely optimal process—only solutions suited to the project's needs. For example, blindly choosing fluorocarbon paint treatment for indoor UHPC decorative walls not only adds unnecessary costs but also conceals the fine original texture of the fair-faced finish; conversely, if ordinary spray paint treatment is chosen for outdoor street-facing UHPC components, obvious color differences and coating damage will appear within 3 years, actually increasing the cost of secondary renovation. Also note that the actual results of the same type of process vary greatly among different service providers. For example, with the same UHPC fair-faced finish, finished products from manufacturers without mature quality control systems will show obvious air bubble and color difference problems, while mature manufacturers verified through projects can control the air bubble defect rate at an extremely low level. For fluorocarbon paint spraying, also check whether the UHPC substrate has been sealed, to prevent later substrate efflorescence from causing coating peeling and flaking. ## IV. The Process Support Logic of Mature Industry Service Providers At present, most domestic manufacturers offering full-chain UHPC services have their own mature process systems, with corresponding quality control standards for different surface treatment needs. For example, unified color difference control for fair-faced UHPC, coating adhesion testing for fluorocarbon paint, and substrate adaptation solutions for spray paint processes all require verification through a large number of actual projects to be reliably implemented. Service providers with nearly 30 years of industry experience will generally provide targeted process selection recommendations based on each project's scenario, budget, and lifespan requirements, helping project owners avoid pitfalls.

### FAQ 1. Can UHPC fair-faced finish be used outdoors? Answer: Yes. UHPC produced with mature processes is inherently extremely dense. For outdoor use, only routine surface pore-sealing treatment is needed, and it offers sufficient weather resistance without additional coatings—suitable for outdoor building projects pursuing original texture. 2. Will UHPC fluorocarbon paint treatment develop paint peeling problems? Answer: As long as the UHPC substrate is properly sealed before construction and qualified fluorocarbon paint materials and standard spraying processes are used, there will be no obvious paint peeling or fading within 15 years under normal outdoor conditions—provided you choose a service provider verified by mature projects. 3. Do the delivery cycles of the three UHPC surface treatments differ significantly? Answer: For regular batch orders, spray paint treatment has the shortest delivery cycle; fair-faced finish treatment takes a middle position due to the fine polishing quality control required; and fluorocarbon paint treatment, due to multi-coat construction, has a delivery cycle 3-5 days longer than spray paint treatment, subject to the project's batch scale.