Metal Roof Coating Application
Coating is applied at 100 sf/gal and two coats are required. To determine the correct amount of product needed divide the square footage of the roof by 250 this is the amount of 5 gallon pails you need for two coats. Divide by 2500 to determine the number of 53 gallon drums required for two coats.
ArmorGarage Metal Roof Coating is very easy to apply and no prior experience is required. It can be brushed, rollered or sprayed on. Following the instructions below will ensure your roof gets coated properly and 100% leak free. If you or your installer has any questions we are happy to help you with any application concerns, our techs have helped customers install millions of square feet of this product.
First thoroughly clean and remove all dirt, mold, mildew or rust from roof, for heavily rusted metal roofs we recommend that you apply a paint compatible rust inhibitor primer let dry thoroughly according to manufacturer's instructions. .
Always test for adhesion, apply ArmorGarage Special Bonding Primer if metal is painted or if coating does not bond to rust inhibitor.
We always recommend a thorough inspection after the roof has been cleaned. Sometimes a very dirty or corroded roof can hide issues. Look for split or wider then normal seams, loose or missing screws, cracked or dry brittle flashing. If you're unsure of any areas take a few pictures and email them to us, we'll tell you exactly how to address the issue if there is one.
Perform any repair work needed with our Roof Mastic, it's a terrific product and goes on easily with a good flashing brush or trowel, it's thick almost like a paste a does a great job fixing, sealing and patching everything on your roof. Coat all bolt/screw heads and lap joints on metal roofs with the Armor Roof Patch Mastic and let dry between 24-48 hrs. Note if your seams are tight and screws are new and tight you do not have to apply the seam mastic. We recommend you check screw heads since they are prone to get loose and or stripped. Retighten loose screws and replace screws that are stripped due to enlarged screw holes with over sized metal roof screws that are easily obtained online. Again if you replace screws or your screws are nice and tight you don't have to apply the mastic but it's always a good idea to do so.
For concrete roofs we recommend putting a thin coat of the Roof Mastic on each joint then embed roofing mesh into that then apply a second coat to fully cover the mesh. This will act as a reinforced expansion joint over the joints. Let the mastic dry overnight and no longer than 48 hrs. Do the same for any metal seams/joints that seem to have bulged or split open. also during your inspection pay close attention to any roof penetrations such as vent pipes, exhaust fans, HVAC equipment. It's a good idea to put a coat of the mastic around the curbs of each of these items. Doing these preparation steps will ensure a 100% watertight installation.
Next mix coating with heavy duty mixer in a 1/2" drill then apply coating with 9" or 18" roller or spray gun. Can even be applied by Brush on smaller roofs, hard to reach places, or roof edges where overspray is not wanted as you see below.
For spray applications on large roofs use a Commercial Sprayer with 3000 psi, .75-1 gpm minimum with a .027 - .031 tip with 3/8" ID hoses. For hose length greater than 60' use 1/2" ID hoses. Graco models-Ultra Max 695, Graco Ultra Max795 or Graco GMax 3400 or similar brand. Maintain the 100 sq ft/ gallon spread rate. An easy way to make sure you get the right coverage is to mark out 500sf squares or rectangles and use 1 pail per 500sf area. We recommed spraying when roof size is 10,000 sf and larger otherwise rolling is just as quick.
Let first coat dry 24 Hrs and then apply second coat. Maintain 1 gallon per 100 sq ft.
Do not start job if temperature will fall below 40 degrees or if rain is forecast within the curing time frame. Do not use on EPDM roofs.
Metal Roof Coating Features
UL and Factory Mutual Fire Rated
Mold & Mildew resistant
UV & Ozone resistant with no sign of pitting or wearing under ASTM 9000 HR Accelerated Weather Test
65% Solids and not water based! Means more of the coating you apply to your roof will still be on your roof after it dries. Many coatings have more than 50% of the coating you apply evaporate away as it dries. That's why they're so cheap to buy, most of the product is either water or inferior solvents. There's no magic formula as to how other roof coatings are sold so cheap it's because they are cheap products, water is cheap, solvents are cheap, silicone is cheap and you get what you pay for. That's why the Air Force stop using the silicone coating they were using, it didn't last and it didn't work and the lifetime warranty was bogus.
Elongation rating of 500% with 99.999% memory retention factor. Means it stretches and contracts more than standard coatings and will maintain it's original shape better and longer. That's a big issue with bargain coatings they stretch out after a few years and once they do that they are not as effective at keep water out of your building!
Flexible down to -40 degrees
Shore A Hardness of 50 is rated for normal foot traffic, very cut and impact resistant
Heat reflectivity of 90% save up to 30% on cooling costs
12 Year Guarantee! Routinely lasts 15-20 years till recoat is required.
This roof coating can be recoated when needed, usually with just one coat! The new coating will reactivate the old coating and they will bond together forming a renewed roof surface with a new guarantee. Be sure to check the roof coating comparison chart HERE
Metal Roof Coating Recommendations
When coating a metal roof with a painted finish we strongly recommend that you remove any loose or peeling paint and apply one coat of our Bonding primer to the entire roof surface to ensure 100% bonding between the Roof coating and your metal roof. Please note that the Ponding Watering coating should only be used with Armor Roof Coatings or Bonding Primer as a basecoat and should always be the final coating on the roof.
If your metal roof has rust spots, you need to wire brush them to remove as much of the rust as possible then prime them with a paintable Zinc primer.
If you have corrosion around your bolts or screws we suggest you hit them with a paintable zinc primer also and apply a dab of our Roof Mastic over them for added protection. That goes for any seams also.
Once your roof is properly coated it should be maintenance free for many years. We would just suggest you keep an eye on the screws and joints. This is where many problems with metal roofs occur. If you've followed our direction you should not have this problem.
Coating must be applied to entire roof for warranty coverage.
Guarantee shall consist of coverage for delamination or erosion of the coating during the warranty period, coating must be applied to entire roof surface, there is no guarantee for partial roof coverage. We have never had an actual product failure but should you feel that the product has failed for any reason we request that the property owner notify ArmorGarage by email or fax with a description and nature of failure. On substantiation of a product defect, ArmorGarage, as its sole liability and the property ownerβs exclusive remedy, will provide sufficient replacement product to repair all affected areas. ArmorGarage is not liable for any labor or consequential damage costs such as but not limited to mold or mildew damage, loss of use or any damage to property.
Exclusions to warranty: Damage arising out of failure to apply coating in accordance with our instructions, natural disasters and acts of God or nature, shifting or swelling of the roofing system or structure, exposure to destructive chemicals, over accumulation of organic materials or other roof debris, failure of previously applied coating(s), acts and causes beyond our control, negligence, misuse of the product, and cosmetic changes in coating appearance. Failure of product due to ponding water areas that lasts longer than 48 hours after last rainfall. For these areas use our Ponding Water Roof Coating.
Because there are extenuating factors beyond our control it is the purchaser's responsibility to repair all roof defects properly such as Rust, delaminating or damaged seams, flashings, mold, mildew or badly deteriorated roofing material prior to application of our roof coatings, to apply product at recommended thickness to a listed compatible surface during proper weather conditions.










