Metal Roof Coating & Sealant

How to  waterproof a metal roof

Our elastomeric rubber coatings for metal roofs provide unmatched flexibility and resistance against harsh weather conditions. From tin roof sealant to corrugated and rusty metal roof sealants, our products are specially formulated for a wide variety of metal roof types. Check out our full selection of rubber coatings for metal roofs below, in addition to application instructions for the best results.


Application Instructions

Metal Roofs, including:  Tin, Aluminum, Rusty Metal, R-Panel, Standing Seam, Corrugated Metal, Butler Buildings, Hangars and Factories:

Surface Preparation (Residential & Commercial): Pressure wash when possible using pure water. Be sure the surface is clean and completely dry before the application of the coating. Read all label instructions before beginning. Surface must be in savable condition, clean and dry, and should have proper drainage. Always run a test patch first in an inconspicuous area, to ensure that proper adhesion and drying occurs and the product works to your satisfaction. Apply Ames® Peel & Stick™ adhesive seam tape and tape on all badly deteriorated fasteners, rubber washers, joints, seams and around vents. Do not use any soaps or detergents to clean the surface.

Need help? Call toll free 1-888-345-0809 to speak with a waterproofing expert.

Tools: Ames® premium elastomeric roof coatings can be applied with a paint brush, a push broom, a paint roller or a commercial/industrial airless sprayer. In addition, you may need Ames® Peel & Stick™ Seam Tape, a pair of scissors and utility knife. For larger commercial jobs, we recommend a commercial/industrial airless sprayer. Call 888-345-0809 with questions or click here for sprayer specifications.


Step 1: Seam Tape all seams, joints, cracks, splits and transitions around vent pipes, air conditioning units and areas where two dissimilar materials come together.

Step 2: On badly deteriorated or extremely rusty metal surfaces, we suggest applying Blue Max at the rate of 1 gallon per 100 sq. ft. Blue Max inhibits and prevents severe rust bleed through.

Step 3: Finish with Maximum-Stretch® at the rate of 2 gallons per 100 sq. ft. or a similar Ames® product such as Ames® Iron Coat®.

How to Waterproof a metal roof diagram

Estimated Coverage: Standard product coverage on a smooth surface for Blue Max®, Ames® Maximum Stretch® and Ames® Iron Coat® is 100 sq. ft. per gallon per coat. Rough or uneven surfaces may require additional product. More than one coat of Ames® Maximum Stretch® or Ames® Iron Coat® is recommended. More coats equal longer life.

Weather & Drying Guidelines: Blue Max® darkens as it dries and is slightly tacky to the touch. Make sure Blue Max is completely dark blue before proceeding with additional coats. Blue Max begins to dry in approximately 2–4 hours, but it is recommended to allow 24 hours between coats to allow for variations in weather and thickness. Blue Max continues to cure for up to two weeks after application.

Dry times are dependent upon the thickness of application, humidity and weather. Maximum-Stretch begins to dry in approximately 2–4 hours, but a full 24 hours between coats is recommended to allow for variations in weather and thickness. Make sure that each coat is completely dry before proceeding with additional coats. The coating should be cured after 24 hours. Some conditions, such as low temperature, high humidity, evening and morning dew, can increase curing times.

Clean-up, Storage, and Disposal: Clean tools and small spills with pure water, no soaps or detergents needed. Store unused product in its original container, tightly sealed and protect from freezing. Dispose of this product in accordance with local, state, or federal requirements.

Products for Metal Roofing

ames iron coat Metal Roof Coating



Ames® Maximum-Stretch® is a thick, high quality rubber and acrylic elastomeric roof coating designed specifically for waterproofing, repairing and maintaining many different types of roofs.


Ames Blue Max Liquid Rubber Waterproof Sealant

Blue Max®

Ames® Blue Max® is a special blend of adhesive, high strength elastomeric liquid rubber. It is a new, impenetrable, rubber technology for waterproofing in extreme wet situations such as below grade foundations, basement walls and a base coat for certain roof types.

ames iron coat Metal Roof Coating

Iron Coat®

Ames® Iron Coat®  industrial strength roof paint is a thick, high quality rubber and acrylic elastomeric roof coating especially formulated for metal. Designed for waterproofing and maintaining commercial and residential metal roofs, as well as mobile home and RV roofs.

Peel & Stick™ Seam Tape

Ames® Peel & Stick™ Seam Tape is a self-adhesive, contouring seam tape for reinforcement over seams and cracks and around vents. Easy to apply.