Roof Guard - Application

Helpful resources

With the proper application and care, Roof Guard can provide long-term protection on existing roofs. Application is simple and you can even do it yourself, although for more worn roofs, we recommend contacting a roofing contractor to help.

NOTE: Remember that Roof Guard should be used together with Armus Water-borne Epoxy Primer, which is universal for different roofing substrates and surfaces.

We have helpful downloadable guides for applying for specific substrates. Below, you can find the application guide for applying Roof Guard.


Questions about application or post-application care? We’ve got you covered and we’re here to help!

Required tools

  • Painter’s tape
  • Power drill
  • Epoxy mixer
  • Paintbrush (2-4” wide for edges)
  • Paint roller extension
  • Spiked roller
    Spiked rollers help to remove air bubbles when applying Roof Guard and provide a near-perfect mil thickness for your coating. The length of the roller spike will determine the mil thickness of your final coating.
  • Airless sprayer (optional)
    If you are choosing to apply Roof Guard using an airless sprayer, please note our specifications of the sprayer you should be using below.
    • Material Flow: 2.9 gal/min (11 liters/min)
    • Max Pressure: 270-300 bar
    • Air Intake Pressure: 5-6 bar
    • Pump Filter: 30 Mesh
    • Hose: 2/8”
    • Nozzle: 0.027” - 0.031”
  • Armus Water-borne Epoxy Primer
    WBE Primer works on almost every substrate and surface and is specially formulated to provide added adhesion to Roof Guard's topcoat. It is easy to apply and surface prep is easy. Its epoxy formulation also provides an additional layer of waterproof protection.
  • Aggregate (optional)
    For a non-slip topcoat, aggregate can be added to the topcoat. Any typical aggregate can be used (ie. gravel, crushed rock, blast-furnace slag).

Surface prep

  1. Wear protective gloves & gear before applying.
  2. Roof must be cleaned from dirt, grease, loose paint, debris, and any residue. Scrub away mold or mildew. Pressure washing may be necessary.
  3. Allow surface to dry completely.
  4. Ensure moisture of the roof is less than 15% prior to application.
  5. REQUIRED: Apply base coat of ARMUS WATER-BORNE EPOXY PRIMER to increase adhesion. Allow WB-Epoxy Primer to cure and dry for 24 hours.
  6. Fleecing joints, seams and penetration points may be required during the application of WBE Primer. See WBE Primer Application Guide for additional details.


Do not apply the product in high humidity conditions (>75%) or if rain is expected within 24 hours after application. Ensure roof moisture is less than 15% prior to application.

Doing so is the easiest way to ensure that you are not over-spreading the material, and that the application of Roof Guard is applied at the proper spread rate.

Application instructions

  1. Open Part A Base. Using a power drill and paddle paint mixer, mix Part A well for a minimum of 1 minute. It is composed of solids, so ensure Base is mixed until fully homogenous.
  2. Pour all of Part B into the Part A container. Completely mix Part A (Base) & Part B (Hardener) together using mixer for a minimum of 1 minute. Mix at a low RPM in the Part A container.
  3. Using a paint brush, paint any edges of your pre-measured section. You should work from the exterior to interior of your coverage area.
  4. If using airless sprayer, spray out your pre-measured section, ensuring you are using the entirety of Roof Guard for the section.
  5. To apply using roller, pour material and spread over your pre-measured section and spread with spiked roller.
  6. Work in sections until entire roof is coated in the same manner, ensuring your spread rate is consistent across the project. Each mixture has a maximum 45-minute working time (at 77°F / 25°C).
  7. Apply aggregate over the final topcoat before Roof Guard fully dries. Non-adhered aggregates must be removed with a high-performance vacuum.
  8. Allow Roof Guard to dry for 8 hours between coats if applying additional coats.
  9. Roof Guard fully dries in 14 hours, and fully cures in 48 hours.
  10. If working in hotter temperatures, store material in shade or in a cool area to maximize pot life.