would gasoline eat it? Wondered if it could fix a gas line.

Yes - gas would eat it, the only thing that will fix a gas line is a new one....

Is this rear differential lubricant compatible?

Permatex 81409 High Temp Red RTV is a Sealant. It is one the most widely used gasket compounds. Made from silicone, RTV is air curing, it seals, bonds waterproofs, fills surface irregularities, remains flexible, doesn't shrink, is relatively easy to remove, and is used as supplementary sealer with almost all low and medium temperature gaskets. It used on the gasket or gaskets of differential. Compatible is not in question because it used on the gasket or gaskets which are outside the flange of differential. I hope that this answer your question. Please let me know if this helps.

Can I seal a knife cut on a rubber roller on a laminator

I was told by my furnace repair man that this is a 5 star

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🔥 Seal the deal with Permatex—where high-temp meets high-performance!

FAST INITIAL CURE - Sets firm in just 1 hour, minimizing downtime and getting you back on the road faster.
EXTREME HEAT ENDURANCE - Withstands up to 650°F intermittent heat—perfect for high-temp engine parts.
FLUID CHEMICAL RESISTANCE - Engineered to resist oil, transmission fluid, and shop chemicals for long-lasting reliability.
OEM SPECIFIED SENSOR SAFE - Trusted by manufacturers and safe for modern engine sensors and advanced materials.
UNIVERSAL GASKET REPLACEMENT - Replaces almost any cut gasket with a durable, formed-in-place seal that resists cracking and shrinking.

Permatex 81409 High-Temp Red RTV Silicone Gasket Maker is a professional-grade, OEM-specified sealant designed for extreme temperature applications (-65°F to 650°F). It forms durable, crack-resistant gaskets that replace traditional cut gaskets and coat pre-cut ones to enhance reliability. Waterproof and resistant to automotive fluids, it cures quickly (initial set in 1 hour, full cure in 24 hours) and is safe for modern engine sensors and materials, making it ideal for valve covers, oil pans, timing covers, and more.

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Color	Factory
Brand	Permatex
Item Weight	6.4 ounces
Liquid Volume	11 Fluid Ounces
Full Cure Time	24 Hours
Initial Hardening Time	one Hours
Item Form	Liquid
Maximum Gap Fill	6 Millimeters
Surface Recommendation	Clean Dry Surfaces like Valve covers, oil pans, timing covers, water pumps, and thermostat housings
Water Resistance Level	Waterproof
Number of Items	1
Manufacturer	Permatex
UPC	686226814098
Global Trade Identification Number	00686226814098
Unit Count	11.0 Ounce
Material	Silicone
Product Dimensions	12 x 1.75 x 1.42 inches
Item model number	81409
Is Discontinued By Manufacturer	No
Manufacturer Part Number	81409
OEM Part Number	81409

Permatex81409 High-Temp Red RTV Silicone Gasket, 11 oz.

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