Sika Sikasil®-N Plus Clear 10oz w/Nozzle

The Sika Sikasil®-N Plus Clear 10oz with Nozzle (MPN 432053) is a professional-grade, one-component neutral cure silicone sealant engineered for automotive restoration, engine bay sealing, and weatherproofing applications where precision and durability matter. As a mechanic, you'll appreciate its non-sag elastomeric formula—it won't slump or run on vertical surfaces during installation, making it ideal for door seals, window gaskets, and oil pan perimeter sealing. This product meets rigorous ASTM C-920 Type S specifications, meaning it delivers consistent adhesion and flexibility across temperature swings your vehicle will experience.

Sikasil®-N Plus is a 100% RTV (room-temperature vulcanizing) silicone that cures through moisture in ambient air—no mixing, no waste, no off-gassing of solvents. The clear formulation allows you to monitor cure progress and inspect seals without disassembly, while the included nozzle ensures controlled, clean application every time. Its neutral cure chemistry eliminates the acetic acid odor common in acetoxy silicones, protecting trim paint and chrome from corrosion during and after installation. The sealant achieves Class 25 movement capability (±12.5% joint width), absorbing vibration and thermal expansion without tearing or losing adhesion—critical for engine bay work where metal expands and contracts.

Restoration shops and DIY enthusiasts benefit most from this sealant on classic and modern vehicles alike—use it for windshield trim, fuel sender gaskets, valve cover sealing, and any joint requiring flexible, paintable waterproofing. The 10oz cartridge (0.75 lbs) is compact enough for precision work yet yields enough material for multiple medium-sized applications. Before application, degrease surfaces with isopropyl alcohol and allow 24–48 hours cure time depending on humidity and joint depth; once set, the sealant tolerates gasoline, oil, coolant, and brake fluid—making it essential for any serious automotive workshop.