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!

UNIVERSAL COMPATIBILITY - Non-setting compound perfect for sealing and gasketing across diverse applications.
ENDLESS APPLICATION FREEDOM - No rush, no cure—work at your own pace with unlimited assembly time.
TRUSTED BY INDUSTRY LEADERS - Used by top airlines, automotive giants, and elite racing teams worldwide.
PRECISION ENGINEERING FROM THE UK - Crafted in the UK for unmatched reliability and performance.
BUILT TO WITHSTAND THE TOUGHEST CONDITIONS - Vibration resistant formula ensures lasting seals even under extreme stress.

Hylomar UK Valco Cincinnati 100 GMS Tube is a premium non-setting, vibration resistant sealant trusted globally by aerospace, automotive, and motorsport industries. Made in the UK and repacked in India, it offers unlimited assembly time and universal compatibility, making it the go-to solution for professionals demanding durable, reliable gasketing.

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Material	Non setting
Brand	Valco Cincinnati
Item Weight	109 g
Item dimensions L x W x H	19 x 3 x 5 Centimeters
UPC	042864033596 191215144747
Net Quantity	100.0 Grams
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

Hylomar UK Valco Cincinnati 100 GMS Tube

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