Loctite Assure 425 Surface-Curing Threadlocker 20 g — Low-Strength for Plastic Fasteners, Tamper-Evident

Loctite 425 Assure is a fast-drying, surface-curing low-strength threadlocker engineered to secure plastic fasteners and provide tamper-evidence while allowing straightforward assembly and disassembly.

Designed for use on plastics and mixed-material assemblies where conventional anaerobic adhesives may not cure reliably, Loctite 425 Assure bonds by curing on the part surface and at the interface of the fastener. Its low-strength formulation holds screws and fittings against vibration and loosening but still permits removal with standard tools. The single 20 g unit offers a convenient size for light production runs, repairs, or maintenance tasks.

How does surface-curing make this threadlocker suitable for plastics?

Because many plastics block anaerobic cure, a surface-curing chemistry like Loctite 425 Assure initiates polymerization where the adhesive contacts the part surface and when trapped under the fastener. This gives reliable fixation on plastic substrates without depending solely on oxygen-free gaps.

• Formulated to cure on plastic surfaces and at metal/plastic interfaces
• Works when conventional anaerobic products fail to set on plastics
• Minimizes risk of uncured residue on non-contact surfaces

Will it allow me to remove screws later if I need to service the product?

Yes — the low-strength grade holds assemblies securely during use but allows disassembly with hand or powered tools when required. It provides tamper-evident security rather than a permanent bond, suitable for serviceable components.

• Low-strength formulation engineered for serviceable joints
• Removes with common screwdrivers or hand tools
• Leaves minimal residue that can be cleaned after removal

How should I apply Loctite 425 Assure for consistent results?

Apply a small bead or a few drops to the fastener or bore before or after assembly; the product is designed to work in both workflows. Tighten to specification and allow the surface cure to develop; handling strength forms quickly while full performance follows per product guidelines.

• Can be used pre- or post-assembly depending on process needs
• Apply sparingly — only a thin film is needed for most fasteners
• Allow recommended cure time for maximum holding and tamper evidence

Are there specific applications where this threadlocker is most useful?

Loctite 425 Assure is ideal wherever plastic fasteners, mixed-material joints, or tamper-evident features are required without sacrificing serviceability. Common uses include electronics enclosures, light fixtures, consumer products, and prototypes where parts may be disassembled later.

• Plastic-to-plastic and plastic-to-metal threaded connections
• Electronics housings and battery compartments needing tamper evidence
• Repair and maintenance tasks where future access is expected

Who is this for: Technicians, product assemblers, service engineers, and DIYers who work with plastic fasteners or mixed-material assemblies and need a reliable, low-strength threadlocker that cures at the surface and remains serviceable. Loctite 425 Assure is especially useful when standard anaerobic adhesives won’t cure reliably on plastic components or when a tamper-evident but removable fixing is preferred.