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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🔧 Seal like a pro, race like a champion!

COMPACT READY TO USE - 100g tube designed for easy handling and long-lasting application.
HERITAGE CRAFTSMANSHIP - Manufactured in the UK, repacked in India, blending quality with accessibility.
RACE PROVEN RELIABILITY - Trusted by Formula One & NASCAR teams for high-performance vibration resistance.
GLOBAL INDUSTRY STANDARD - Used by top airlines, automotive, and heavy equipment manufacturers worldwide.
ENDLESS PRECISION SEALING - Non-setting formula ensures a perfect seal every time, no rush needed.

Hylomar UK Valco Cincinnati 100 GMS Tube is a premium non-setting, vibration-resistant sealant trusted globally by elite automotive, aerospace, and industrial manufacturers. Its unlimited assembly time and proven durability make it the go-to gasketing compound for professionals demanding flawless performance.

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Material	Non setting
Brand	Valco Cincinnati
Item Weight	0.24 Pounds
Item dimensions L x W x H	19 x 3 x 5 Centimeters
UPC	042864033596 191215144747
Net Quantity	100.0 gram
Number of Items	1
Manufacturer	0
Product Dimensions	19 x 3 x 5 cm; 108.86 g
Item model number	710XX283
Manufacturer Part Number	71283
OEM Part Number	RTC3347
Volume	100 Millilitres
Size	one size
Stain Resistant?	No
Assembly Required	No
Special Features	Vibration Resistant
Manufacturer	0
Country of Origin	United Kingdom
Item Weight	109 g

Hylomar UK Valco Cincinnati 100 GMS Tube

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