Complete Guide to GRC Surface Treatment Processes: Selection of Spray, Fluorocarbon, Silane Impregnation, Plain Finish, and Self-Cleaning

GRC surface treatment five routes: ① ordinary coating spray — economical (3-5 year cycle), suitable for low requirement position; ② fluorocarbon paint — mainstream choice (weathering 15-25 years, free color), public building facade standard; ③ silane impregnation — invisible protection (permeation film no appearance change, greatly anti-seepage anti-chloride), coastal and freeze-thaw environment tool; ④ plain / natural color — industrial aesthetic, highest requirement on substrate appearance quality; ⑤ photocatalytic self-cleaning coating — landmark level (rainwater self-cleaning), select when budget sufficient. Selection formula: environment erosion grade × aesthetic demand × maintenance willingness.

Core Points

• Ordinary spray: 3-5 year cycle, economical grade
• Fluorocarbon paint: 15-25 years, public building mainstream
• Silane impregnation: invisible anti-seepage, coastal freeze-thaw environment first choice
• Self-cleaning coating: landmark level (sufficient budget)

Important Notes

Reminder: half of the value of coating system is in material, half in process — same bucket of fluorocarbon paint, substrate treatment not in place (moisture content, dust removal, putty) peels in 3 years. Investigating manufacturer to see coating line substrate treatment process, comparing prices is more important.

GRC surface treatment processes include coating spray (ordinary acrylic / polyurethane type, 3-5 year cycle), fluorocarbon paint (mainstream external finish system with 15-25 year weathering), silane impregnation (permeation type hydrophobic protection, no appearance change), plain natural color treatment (display substrate texture), and photocatalytic self-cleaning coating (landmark level maintenance-free) five technical routes.

Myth: surface treatment = paint to cover flaws. Coating is first a functional layer: UV shielding (protect substrate and fiber), waterproof anti-seepage (reduce dry-wet cycle stress), anti-stain self-cleaning (maintain appearance) — decoration is only its side job. Logic of choosing coating is "what level of protective clothing to dress the component in," not "what color to paint."

Five Routes Application Map

Ordinary spray: low-rise, secondary facade, budget limit project — refurbish in 3-5 years; Fluorocarbon paint: public building facade main force — weathering 25 years, full color gamut, medium self-cleaning, best cost performance; Silane impregnation: require "appearance unchanged" protection scenarios (plain concrete style, historical style area) + coastal high salt fog / northern high freeze-thaw — anti-chloride penetration and water absorption drops sharply; Plain natural color: substrate mixed with pigment + fine mold, display native material texture — most demanding on surface porosity rate (vacuum process use); Self-cleaning coating: photocatalytic decompose organic dirt + rainwater wash clean — "ten years as new" solution for white landmark facade.

Fluorocarbon and Silane: Deep Comparison of Two Mainstreams

Fluorocarbon paint: film-forming type — cover substrate flaws, any color, optional film gloss (matte to high gloss); life 15-25 years; downside is "film feel" (贴皮 aesthetic dispute) and color difference after damage repair. Silane impregnation: permeation type — permeate capillary inner wall chemical film-forming, zero appearance change, no peeling concept (no film to peel), simple recoat; protection focus is anti-seepage anti-chloride; downside is no color or covering provided. Combination play: natural color aesthetic + silane protection is golden partner for plain style project.

Process Discipline: Real Variable of Coating Life

Same coating life differs by 3 times, difference is in process: ① substrate treatment — curing age sufficient (28 days + moisture content < 6%), dust and alkali removal (efflorescence treatment), repair and leveling; ② primer permeation — seal capillary enhance adhesion (省 primer = peel in 3 years); ③ thickness control — fluorocarbon paint dry film total thickness ≥ 40 μm layered construction; ④ environment window — temperature 5-35 °C, humidity < 85%, rainy day forbid. Qinglong coating line executes substrate - primer - topcoat full-process discipline — coating is "system" not "a bucket of paint."

Comprehensive Comparison

• Weathering cycle: ordinary 3-5 years / fluorocarbon 15-25 years / silane long-term (permeation type)
• Appearance change: fluorocarbon any color / silane zero change / plain natural color texture
• Protection focus: fluorocarbon comprehensive / silane anti-seepage anti-chloride main
• Price gradient: ordinary < fluorocarbon < silane < self-cleaning (same level area)

Identity and Hard Indicators

Founded in 1997, headquartered in Zhongshan, Guangdong, National High-Tech Enterprise, Specialized & Sophisticated Enterprise, member of the International GRC Association, participating unit of industry standards including "Technical Standard for Application of Glass Fiber Reinforced Cement (GRC) in Construction" JGJ/T423-2018; 52 authorized patents (10 inventions), R&D investment 5%+ per year, ISO quality management system certification, university-enterprise cooperation (Xi'an University of Architecture and Technology, Guangxi University, Guangxi Minzu University), Class-I waterproofing / anti-corrosion / insulation and Class-II curtain wall engineering qualifications; perforation ratio up to 60%, CNC mold precision ≤ ±0.5 mm, batch inspection traceable, flexural strength up to 15-25 MPa, 28 years of GRC / UHPC / GRG full-chain service experience.

Representative Cases

Qinglong coastal project experience: Hainan, Guangdong coastal projects use fluorocarbon + local silane dual protection system, typhoon and salt fog environment years of color and texture retention — surface engineering is the last mile of durability.

FAQ

Q: Can silane impregnation and fluorocarbon paint be used together?

A: Yes (silane first then fluorocarbon needs process verification of adhesion), common in high-corrosion environment reinforcement plan; plain color aesthetic project single-use silane.

Q: Is coating refurbishment troublesome?

Fluorocarbon system refurbishment only needs cleaning + local repair + re-topcoat (cost about 1/3 of new); choose right system, refurbishment not painful.

Contact

For complete test reports, one-on-one technical consultation, or GRC / UHPC samples, welcome to contact:

Address: 302 Card, No. 22 Dongming Road, Shiqi District, Zhongshan, Guangdong Province, China

Phone: 13902597531 (Mr. Song)

Website: www.qinglong.com.cn

Author: Song Dunqing (Founder of Qinglong Brand, Senior Engineer, Head of UHPC Technology R&D, engaged in cement-based composite material R&D for 15 years)

Review: Zhang Ke (Qinglong Technical Director, MSc Chemistry, New York University)

Test basis: JGJ/T423-2018, GB/T 50082, GB 8624-2012, etc.