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ALDOSEAL 399

1 of 3 products in this brand
ALDOSEAL 399 is a high solid, low VOC, one-part silicone elastomeric flashing grade specifically designed for use in sealing roof penetrations, curbs, seams, flashing areas and any other roof top areas of possible water infiltration. It is also the sealant of choice for any roof system that has been previously coated with a silicone elastomeric coating. Once applied, this silicone flashing grade provides a durable, seamless and flexible system that resists lateral movement, shear and will allow for normal expansion and contraction. ALDOSEAL 399 provides greater waterproofing protection than similar flashing grade silicone sealants and offers increased resistance to moisture penetration.

Product Type: 1K (1 component) Coating, 1K (1 component) Sealant

Application Area: Roofing Membranes

Application Method: Brush, Roller, Spray

Chemical Family: Silicon-based Compounds

Technical Data SheetSafety Data Sheet
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Knowde Enhanced TDS

Identification & Functionality

Chemical Family

Silicon-based Compounds

Product Type

1K (1 component) Coating,

1K (1 component) Sealant

Technologies

Ready-to-Use Products

Product Families

Ready-to-Use Products — Adhesives & Sealants

Caulks & Sealants

Features & Benefits

Ready-to-Use Product Features

Durable,

Excellent Substrate Adhesion,

Flexible,

High Solids Content,

Low VOC

Applications & Uses

Markets

Building & Construction

Applications

Building & Construction — Building Envelope & Roofing

Waterproofing & Weatherproofing

Building & Construction — Building Materials

Sealants & Caulks

Application Area

Roofing Membranes

Application Method

Brush,

Roller,

Spray

Uses
  • ALDOSEAL 399 was specifically developed as a protective sealant for pipe boots, seams, flashing areas, curbs, exposed fasteners and all other breaches in a roof system that will allow water to enter a structure.
  • With excellent adhesion to other silicone products, ALDOSEAL 399 is proven to provide long term durability versus water based sealants.
Application Instructions
  • ALDOSEAL 399 may be applied by soft brushes or trowels.
  • Apply ALDOSEAL 399 only to clean, dry, sound surfaces free of loose particles or other foreign matter.
  • For best results, ambient temperature should be between 50 - 90 °F. Higher temperatures will shorten the cure time and working time for proper application of granules before the material has skinned. Lower temperatures will lengthen the skin over, tack free and ultimate cure time. Sudden temperature declines may also result in dew formation on surfaces, which can prevent adhesion development.
  • For best results, relative humidity should be above 20%. Lower humidity will slow the cure time significantly.
  • Apply ALDOSEAL 399 at a rate of no greater than 50 wet mils.
  • Minimum dry mil thickness shall be above 25 mils.
  • Coverage rates per gallon - 750 fasteners; 100 linear feet of seam at 4” wide and 40 wet mils.
Clean Up Solvent

Aldo Thinner II

Properties

Typical Properties
ValueUnitsTest Method / Conditions
Total Solids (Volume)92 - 98—%
Weight10.7—lbs/gal
Flash Pointmin. 200—°F
Viscosity150000.0—cPs
Elongation (Initial)275.0—%
Hardness45 - 55—Shore A
Tensile Strength130.0—psi
Permeability4.2—perms
Service Temperature-25 to 175—º F
Cure Time12.0 - 18.0—Hours
Tack Free1.0 - 2.0—Hours
VOCmax. 50—g/l

Storage & Handling

Shelf Life
12 Months (50°F - 85°F)
Storage & Handling
  • Avoid contamination in sealed containers.
  • Store away from heat and sources of ignition.
  • Do not inhale vapor or mist; do not get on skin, in eyes or on clothing.