Permatex 80008 Form-A-Gasket #1 is a fast-drying, hard-setting gasket sealant sold in a 3 oz tube, rated -65°F to 400°F and resistant to fuels and shop fluids. The reviewer addresses fitment, cure time, viscosity, and adhesion to cast iron and aluminum, noting precise bead control, small-joint suitability, and prep requirements. How well does it hold on freeze plugs and intake flanges under heat cycling? The next section compares real-world performance.
Key Takeaways
- Fast-drying, hard-setting gasket maker that forms permanent seals on rigid materials and flanges.
- 3 oz. tube provides precise application for small to medium repairs but may be insufficient for larger jobs.
- Resistant to fuels, oils, and shop fluids with a temperature range of -65°F to 400°F.
- Best for freeze plugs, threaded connections, manifold gaskets, and rigid, non-moving assemblies.
- Requires careful surface prep and bead control; not recommended where flexibility or movement is needed.
Product Overview and Key Features
Permatex 80008 Form-A-Gasket #1 Sealant is a fast-drying, hard-setting gasket maker designed for permanent seals on rigid materials and flanges. The 3 oz. tube provides an easy-to-apply bead for small to medium repairs.
The reviewer notes sealant benefits: durable bonds, fuel resistance, and a -65°F to 400°F temperature rating.
Application versatility includes freeze plugs, threaded connections, manifold gaskets.
What quantity is needed? One 3 oz. tube covers small jobs; use multiple tubes for larger surfaces.
Practical considerations: cure time, substrate cleanliness, and bead size control.
Summary: compact, precise, and engineered for permanent assemblies.
Performance and Application Results
Overall performance in real-world applications proves reliable: the 3 oz. tube delivers consistent bead control, quick tack, and cured rigidity. Reviewers note strong sealant effectiveness against fuels and oils, steady temperature tolerance (-65°F to 400°F), and clear application versatility across flanges, freeze plugs, threaded joints. Practical considerations: cure time, joint gap limit, and surface prep.
| Test | Result |
|---|---|
| Fluid resistance | Excellent |
| Temp range | -65°F to 400°F |
| Cure time | Fast (hours) |
| Gap fill | Moderate |
| Ease of use | Good |
Q: How long to cure? A: Hours, depending on thickness.
Pros, Cons, and Recommended Uses
Having reviewed performance and application results, the assessment now moves to concrete pros, cons, and recommended uses to help decide where the product fits in most shops and home garages.
Pros:
- fast-drying, hard-setting;
- resists fuels and shop fluids;
- temperature range -65°F to 400°F;
- useful for freeze plugs, threaded connections, manifold gaskets;
- sealant advantages include durability and permanent assembly.
Cons:
- not flexible, limited for moving seals;
- 3 oz tube may be small for large jobs;
- surface prep essential.
Q: Who should use it?
A: Mechanics needing rigid, permanent seals.
Recommended: patching holes, rigid flanges, permanent assemblies.
Frequently Asked Questions
Is This Sealant Paintable After Curing?
Yes. He notes the sealant forms a paintable surface after full curing; paint adhesion improves once curing time completes and the material is hard. He recommends testing paint compatibility on a small cured patch first.
What Is the Shelf Life Unopened?
About five years unopened; coincidentally, unopened containers often outlast expectations. The manufacturer’s stated shelf stability supports product longevity when stored cool, dry, and sealed, preserving performance for approximately five years unopened.
Is It Safe for Use on Aluminum Surfaces?
Yes; the product is compatible with aluminum surfaces. The observer notes aluminum compatibility during sealant application, recommending clean, dry mating faces and proper curing to guarantee durable, leak-free seals in automotive and industrial assemblies.
Does It Require a Primer for Plastics?
A hobbyist once glued a model boat without sanding; no, it generally does not require a primer for plastics. He notes plastic bonding varies, so sealant compatibility should be checked, especially with flexible or low‑energy plastics.
How Long Before It Can Withstand Fuel Exposure?
It typically tolerates fuel exposure after full cure, which occurs in 24–72 hours; the manufacturer cites fuel tolerance duration post-cure, supported by chemical resistance testing indicating stability against common fuels once fully set.
