gasket marker or gasket maker?

Neither marker or maker. It is a joint sealant that can be used with or without a gasket

Can I use this to permanently seal the 24" X 24"inspection lid on my boats onboard 60 gallon gas tank ?

If you are using a gasket, I would guess Hylomar would be a good product. I did use this product on a rubberized cork gasket for a fuel sending unit. Hylormar did the trick nicely. If you are not using a gasket, I don't think Hylomar would be the right product. Hylomar doesn't dry out or cure as a permanent gasket maker like RTV sealant.

Has anyone used this on a BMW valve cover gasket with good success?

Hello! I have used this Hylomar gasket to seal MG head gaskets, Cadillac 4100cc intake manifold gaskets, and other really difficult applications. I can't see that a BMW valve cover gasket will pose any problems. Just apply a thin film on both sides of the gasket and close within 10 minutes. The Hylomar never dries out so it doesn't shrink. The secret to valve cover gaskets cork or rubber is to not over tighten the retaining bolts. There is probably an Inch Pound torque spec for your car which you should follow. Hope this helps.

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Valco 71283 100 Gram Blue Hylomar Tube w/Nozzle

Valco 71283 100 Gram Blue Hylomar Tube w/Nozzle

Product ID: 102697763

Details

Material
metal
Brand
Valco
Style
Industrial
Item weight
0.24 Pounds
Item dimensions L x W x H
19 x 3 x 5

💧Moisture & chemical proof

🔥Heat & vibration resistant

🛠️3.5 oz precision tube

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VT19138

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Description

🔧 Seal like a pro, perform like a legend!

DURABLE PROTECTION - Flame, dust, moisture resistant for long-lasting performance
NON HARDENING FORMULA - Unlimited assembly time, no cracking or setting
VERSATILE APPLICATION - Perfect for pumps, manifolds, gearboxes & more
EXTREME CONDITION PROOF - Withstands rapid temperature changes & combustion products
UNIVERSAL ENGINE SEALANT - Trusted worldwide for gas & diesel engines

The Valco 71283 Blue Hylomar Tube delivers a 3.5 oz industrial-grade, non-hardening sealant trusted globally for sealing gas and diesel engines. Its vibration and temperature resistant formula ensures flawless metal-to-metal contact and protection against moisture, combustion products, and oils—ideal for automotive and industrial maintenance demanding reliability and longevity.

Specifications

ASIN	B00CFH9GZG
Brand	Valco Cincinnati
Compatible Material	Metal
Item Dimensions	19 x 3 x 5 centimetres
Item Form	Liquid
Item Weight	0.24 Pounds
Item dimensions L x W x H	19 x 3 x 5 centimetres
Item weight	0.24 Pounds
Manufacturer	Silver Seal
Manufacturer Part Number	71283
Material	metal
Model Number	710XX283
Number of Items	1
Style	Industrial
Style Name	Industrial
UPC	042864033596 191215144747
Unit Count	1 Count
Water Resistance Level	Water Resistant
Water resistance level	Water Resistant

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VT19138

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