The 5 Best Silicone Roof Coatings for Commercial Roofs (2026)
The best silicone roof coating for most commercial flat roofs is APOC 585 Armor Flex. It's 98% solids, rain-safe in 15 minutes and built to handle ponding water, and it's the silicone our crews at Central Roofing apply on restoration jobs across Los Angeles and Orange County.
A silicone roof coating turns an aging flat or low-slope roof into a seamless, reflective, waterproof membrane, often for a fraction of the cost of a tear-off. But the products aren't interchangeable. Solids content, ponding-water performance, adhesion and cure time all vary from brand to brand.
We're a commercial roofing contractor that does roof coatings and restoration every day. Below are the five silicone coatings we think are worth a building owner's money, ranked, with the specs that matter.
Quick Picks
| Rank | Coating | Solids (by weight) | Best for |
|---|---|---|---|
| 1 | APOC 585 Armor Flex | 98% | Ponding water, one-coat jobs, overall value |
| 2 | SOPREMA 924 Eterna-Sil Premium (formerly TRP) | >96% | Recoats over existing silicone |
| 3 | Lucas #8000 | 98% | Primerless adhesion on many substrates |
| 4 | ASC S Silicone Coating | High solids | Thick single-coat builds (40+ mils) |
| 5 | Henry Pro-Grade 988 | 100% silicone | Dusty sites (dirt pick-up resistance) |
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The Top 5, Ranked
APOC 585 Armor Flex Liquid Silicone Roof Membrane
APOC 585 Armor Flex is the silicone we trust on our own jobs. It's a moisture-cure, solvent-free, high-solids silicone with APOC's Pond-Proof technology, and it builds a thick, durable membrane in a single pass.
| Spec | APOC 585 Armor Flex |
|---|---|
| Solids by weight / volume | 98% / 98% |
| Tensile strength | 275 psi |
| Elongation | 425% |
| VOC | Under 10 g/L |
| Rain safe | 15 minutes |
| Coats | One-coat application |
Why we like it
- It handles ponding water. Plenty of flat roofs in LA and Orange County hold water after a storm. Armor Flex is formulated to resist ponding water, which is where acrylics tend to break down.
- More coating per gallon. At 98% solids, almost everything we spray stays on the roof as membrane, so a single coat builds real thickness.
- Rain safe in 15 minutes. Marine-layer mornings and surprise showers don't wash it off, so jobs finish on schedule.
- It cures in cooler weather. That keeps our crews working into winter.
- It stays flexible. 425% elongation lets the membrane move with the roof through hot days and cool nights without cracking.
- Bright white and reflective. A cooler roof surface means lower cooling loads for the building below.
- Low VOC. Under 10 g/L, which makes it easier to apply on occupied buildings.
- A complete system. We pair it with APOC 583 Armor-Base primer on asphalt roofs to block bleed-through, and APOC 581 Armor Flash for seams and details. See how the full system goes down on our silicone roof coating service page.
“We've tested a lot of silicones. Armor Flex is the one we keep coming back to because it goes down thick, it holds up to ponding water, and it doesn't slow our crews down.” — Andy, Central Roofing
SOPREMA 924 Eterna-Sil Premium Roof Coating
If you've specified Tropical Roofing Products #924 before, this is the same coating under a new name. SOPREMA has folded the entire Tropical/TRP coatings line into the SOPREMA brand. Same formula and performance, new SOPREMA packaging and SKUs.
924 Eterna-Sil Premium is a professional-grade, 100% silicone, solvent-free, single-component coating. Its standout trait: it can be recoated over itself and over other silicone coatings, which keeps future maintenance simple.
- Solids: over 96% by weight, over 95% by volume
- Tensile over 240 psi, elongation over 270%
- Initial solar reflectance 0.87, initial SRI 110
- Miami-Dade, Florida Building Code and UL approved; FM 4470 and CRRC rated
- Not recommended for standing water lasting longer than 72 hours
Lucas #8000 100% Silicone Roof Coating
Lucas #8000 is a 98%-solids, moisture-cure silicone known for primerless adhesion to many surfaces (tested to ASTM D6694). It contains no solvents or water, so it won't freeze in storage.
- Solids: 98% by weight, 97% by volume
- Substrates: SPF, EPDM, PVC, TPO, aged acrylic, concrete, asphalt BUR, granulated mod-bit and metal
- Typical application: a base coat and a second coat, each at 1 gallon per 100 sq. ft.
ASC S Silicone Coating
ASC S, from ASC Building Materials (American Standard Coatings), is a one-component, moisture-curing silicone rubber coating made here in Southern California. Its high solids and lack of hydrocarbon solvents let it go on at more than 40 mils in a single coat without blistering.
- Works over smooth BUR, granulated cap sheet, well-adhered acrylic, concrete, metal, SPF and various single-ply membranes
- Miami-Dade approved as a roof maintenance coating
- Available in custom colors
Henry Pro-Grade 988 Silicone White Roof Coating
Pro-Grade 988 is a 100% silicone, solvent-free, one-component coating from El Segundo-based Henry, a Carlisle company. Its patented Dirt Pick-Up Resistance (DPUR) formula helps the roof stay cleaner and more reflective over time, which matters near freeways, industrial parks and dusty Inland Empire sites.
- Dries in as little as 15 minutes, per Henry
- Meets ASTM D6694 for liquid-applied silicone coatings
- Available in white and a range of colors
How to Choose a Silicone Roof Coating
The right product depends on your roof, not the label on the bucket. Check these five things first:
- Solids content. Higher solids means more dry film per gallon and fewer coats. Look for 95% or above.
- Ponding water. If your roof holds water 48 hours after rain, choose a silicone rated for ponding water, like APOC 585. Ponding is one of the main reasons we recommend a silicone roof coating system over acrylic.
- Substrate and adhesion. Silicone bonds to most roofs, but asphalt surfaces usually need a bleed-blocking primer. A field adhesion test should always come first.
- Recoatability. Silicone generally only bonds to silicone. Plan for future maintenance coats from day one.
- Warranty and installer. Manufacturer warranties usually require an approved contractor and a specified mil thickness. The installer matters as much as the product.
Silicone vs. Acrylic Roof Coatings
Silicone is the better choice for flat roofs with ponding water, while acrylic roof coatings cost less and suit sloped roofs with good drainage.
| Silicone | Acrylic | |
|---|---|---|
| Ponding water | Resists it | Breaks down under it |
| Solids | Typically 90–98% | Typically 50–65% |
| Coats needed | Often one | Usually two or more |
| Dirt pickup | Higher (unless DPUR-type formula) | Lower |
| Recoat with | Silicone only | Acrylic or silicone |
| Upfront cost | Higher | Lower |
Not sure which fits your building? We inspect the roof, run adhesion tests and recommend the system, free. Our roof maintenance programs keep a coating at full performance for the long haul.
Frequently Asked Questions
What is the best silicone roof coating?
For most commercial flat roofs, we recommend APOC 585 Armor Flex. It's 98% solids, resists ponding water and is rain-safe in 15 minutes. It's the silicone Central Roofing uses on its own restoration projects.
How long does a silicone roof coating last?
A properly installed silicone coating typically lasts 10 to 20 years, depending on thickness and maintenance. It can then be recoated with more silicone rather than replaced.
Can silicone roof coating be applied over an existing roof?
Yes. Silicone goes over most existing BUR, modified bitumen, single-ply, metal, concrete and SPF roofs. The roof must be cleaned, repaired and adhesion-tested first. Here's how our silicone coating process works, step by step.
Is silicone better than acrylic for flat roofs?
Usually, yes. Silicone resists ponding water, which is common on flat roofs. Acrylic is cheaper but breaks down where water sits.
What happened to Tropical Roofing Products (TRP)?
Tropical Roofing Products, later called TRP Roofing Products, was part of the SOPREMA group for years. SOPREMA has since moved the whole TRP coatings line under the SOPREMA name. Products like 924 Eterna-Sil Premium are the same formulas, now sold in SOPREMA packaging.
How much does a silicone roof coating cost in Los Angeles?
Cost depends on roof size, condition, repairs and required thickness. Request a free estimate and we'll give you a written, no-obligation price.
Get Your Roof Coated Right
All five of these are professional-grade silicones, but APOC 585 Armor Flex is the one we put on our customers' roofs. Whatever product you choose, the result depends on proper cleaning, repairs, priming and mil thickness.
Central Roofing has restored commercial roofs across Los Angeles and Orange County for 30+ years, from our offices in Gardena and Huntington Beach.
Get a Free Estimate Our Silicone Coating Service Call 310-527-6770Specs from manufacturer data sheets: APOC 585, SOPREMA 924, Lucas #8000, ASC S, Henry 988. Always confirm current specs with the manufacturer before specifying.
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