Aerokroil vs Silkroil? Which is better?

I have the silo croil and if you spray it several times in a two day period it will creep into the thread bolts and will loosen the bolts.I’ve never used a better product it’s really great you have to be patient and it will work.

I consider it to be far superior to WD-40 both as a penetrating and a lubricating oil.

Before using, should I heat the seized hex bolt, or the surrounding cast iron?

I'd let the kroil sit for a while and try it before heating. A torch is usually the 2nd to last option before drilling

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🛠️ Break Free, Stay Smooth — The Pro’s Secret Weapon

MULTI INDUSTRY POWERHOUSE - From mechanical repairs to marine maintenance, Kroil is the go-to penetrant for pros who demand results.
PRECISION AEROSOL DELIVERY - 16.5oz can offers controlled spray for targeted lubrication on hinges, chains, and moving parts.
ULTIMATE CORROSION DEFENSE - Displaces moisture and shields metal from humidity and saltwater—ideal for marine and outdoor use.
UNLOCK RUSTED BOLTS WITH EASE - Silicone-infused formula penetrates deep to free stuck parts fast, saving you torque and effort.
TRUSTED AMERICAN CRAFTSMANSHIP - Made in the USA since 1939, Kroil guarantees professional-grade quality and reliability.

Kroil Penetrating Oil with Silicone is a 16.5oz aerosol spray designed to effortlessly loosen rusted bolts and lubricate moving metal parts. Enhanced with silicone for superior penetration and moisture displacement, it protects against corrosion in harsh environments. Trusted by professionals since 1939 and proudly made in the USA, Kroil delivers fast, reliable performance across mechanical, marine, and industrial applications.

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Material	Metal
Brand	KROIL
Liquid Volume	16.5 Fluid Ounces
Item Weight	1.3 Pounds
Recommended Uses For Product	Mechanical
Item Form	Aerosol,Oil
Manufacturer	Kano Laboratories LLC
Item Weight	1.25 pounds
Product Dimensions	2.75 x 2.75 x 10 inches
Item model number	SK162
Is Discontinued By Manufacturer	No
Manufacturer Part Number	SK162

KROILPenetrating Oil with Silicone (Aerosol Spray-16.5oz Can-Single) | Penetrant for Rusted Bolts, Metal | Lubricant for Hinges, Chains, Moving Parts (SK162)

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