Rust-oleum 301899 Fibered Asphalt Roof Cement 1 Gallon

Product Description

The RUST-OLEUM 301899 is a fibered, asphalt-based plastic roof cement formulated for creating a strong, flexible seal on low-slope and flat roofing systems. Packaged in a one-gallon container, it applies smoothly without stringing, making it practical for field use in both install and repair scenarios. The fibered composition resists cracking under thermal cycling and weathering. Roofing contractors, general contractors, and experienced DIYers install this product as part of flashing work or exterior masonry sealing on commercial and residential structures.

This roof cement is suited for a wide range of roofing and masonry applications. It is designed for installing or repairing roof flashings at valleys, parapet walls, gravel stops, stacks, vents, monitors, and similar transition points. It also seals cracks in exterior foundation and chimney walls. When used in combination with fiberglass, polyester fabric, or roll roofing material, it supports permanent repairs on built-up and modified roofing assemblies.

Key Features

• Fibered asphalt formula provides a flexible, crack-resistant seal
• Smooth, no-string application speeds up fieldwork
• Compatible with fiberglass, polyester fabric, and roll roofing for permanent patches
• Seals flashings at valleys, parapet walls, gravel stops, stacks, and vents
• Suitable for exterior foundation and chimney wall crack sealing
• Black finish blends with standard asphalt roofing surfaces

Compatibility

Designed for use with fiberglass mesh, polyester roofing fabric, and roll roofing materials on low-slope and flat residential and commercial roofing assemblies requiring flashing installation or repair.

Installation Notes

Licensed roofing contractors typically apply this product following applicable local building codes and manufacturer surface-preparation requirements. Surfaces should be clean, dry, and free of loose material before application. Apply using a trowel or putty knife; avoid application in freezing temperatures or when rain is imminent. Always work in a well-ventilated area and wear appropriate personal protective equipment when handling asphalt-based products.

Technical Specifications

• Container Size: 1 gallon
• Color: Black
• Formula Type: Fibered, asphalt-based
• Weight: 19.8 pounds
• Unit of Measure: Each
• Package Quantity: 2

Standard Information

• Brand: RUST-OLEUM
• Manufacturer Part Number: 301899