ZIP System Liquid Flash solves the sealing problem where tape can’t deliver. This 10.3 oz cartridge of STPE (Silyl-Terminated Polyether) material seals irregular shapes where tape cannot lie flat — curved openings, penetrations, and deep gaps. At 20-40 minute tack-free time and 4-hour performance cure, it transforms complex flashing jobs from tape-wrestling matches into straightforward applications.
For Montana contractors dealing with window installations, pipe penetrations, and the inevitable oddball shapes that show up on every job, Liquid Flash delivers measurable time savings over traditional methods. The chemistry works down to 35°F — critical for extending the shoulder season when Montana weather won’t cooperate.
Technical Specifications and Coverage
The 10.3 oz cartridge covers approximately 10 linear feet — enough for three 3-ft window sills when applied at the required 12 mil thickness. That thickness matters. Spread it until the substrate is no longer visible — that’s your 12 mil target.
| Specification | Value |
|---|---|
| Volume | 10.3 oz (306 ml) |
| Tack-free time | 20-40 minutes |
| Full cure (12 mil) | 4 hours |
| Full performance | 24 hours at 70°F |
| Application temperature | 35°F to 110°F |
| Coverage | ~10 linear feet |
| Vapor permeance | 23-24 perms at 15 mil |
| Shelf life | 24 months unopened |
The STPE chemistry — essentially a silicone-urethane hybrid — creates a permanently elastic seal that accommodates building movement. Unlike rigid sealants that crack when framing shifts through Montana’s temperature swings, this material stays flexible. It bonds to damp surfaces and cures even when water hits it during application.
Application Advantages and Material Compatibility
The real value shows up in problem areas. Curved openings, deep gaps, joist and rafter gaps, panel seams, foundation transitions — anywhere tape struggles to maintain contact or fill voids. Standard caulking gun application means no special equipment. Cut the tip, apply a continuous bead, spread to 12 mils with a plastic spreader or brush, and move on.
Material compatibility covers the jobsite spectrum: ZIP System sheathing, OSB, plywood, lumber, concrete, masonry, architectural metals, PVC, vinyl, FRP, EPDM, and glass. Porous concrete might need priming — test first. The chemistry bonds without primers on most surfaces, saving prep time.
Professional contractors report its value in sealing around windows, doors, penetrations, and transitions from wall sheathing to foundations. The moisture-curing formula transforms ZIP System sheathing into a continuous air and moisture barrier — no gaps where tape edges lift or penetrations create vulnerability.
Performance Certifications and Warranty
The product meets AAMA 714-15 (Voluntary Specification for Liquid Applied Flashing), passes ASTM E331 (Water Penetration Resistance), ASTM E2357 (Air Leakage Resistance), and ASTM C920 (Standard Specification for Elastomeric Joint Sealants). Manufacturing follows ISO 9001 registered processes.
Warranty coverage includes a 30-year ZIP System Limited Warranty when used with ZIP System sheathing, plus a 180-day Exposure Guarantee for weather resistance before being covered. That 180-day window matters in Montana where weather delays between trades are common. Framing sits exposed while waiting for windows or siding — this material handles it.
Customer ratings average 4.2 to 4.8 stars across retailers, with contractors highlighting ease of use for window sills and irregular shapes. Some mention the price premium but consider it worth the time saved on complex flashing tasks.
Frequently Asked Questions
How much area does one 10.3 oz cartridge cover?
One cartridge covers approximately 10 linear feet when applied at the required 12 mil thickness, sufficient for three 3-ft window sills. Coverage depends on bead size and spreading technique.
Can this be applied in cold weather?
Yes, application temperature range is 35°F to 110°F. The material bonds to damp surfaces and continues curing even if water contacts it during application.
What’s the difference between tack-free time and full cure?
Tack-free occurs in 20-40 minutes depending on conditions. The material reaches 12 mil target thickness in approximately 4 hours and achieves full performance in 24 hours at 70°F.
Does this replace ZIP System tape entirely?
No. Liquid Flash excels where tape cannot lie flat — curved openings, penetrations, deep gaps, and transitions. It fills voids better than tape and offers superior flexibility. Unlike most flashing tapes, it can be painted once cured. Use tape for straight seams and liquid for complex areas.
What surfaces require priming?
Most surfaces bond without primers, including wood, OSB, plywood, metals, PVC, vinyl, FRP, EPDM, and glass. Porous concrete may require priming — test first.
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