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

💧Water & moisture proof

🌡️Withstands rapid temperature changes

🛠️Non-hardening & vibration resistant

¥13338

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Description

🔧 Seal like a pro, perform like a legend.

ENDLESS ASSEMBLY TIME - Non-setting formula gives you unlimited flexibility during installation.
SEAMLESS METAL BONDING - Ensures perfect metal-to-metal contact for ultimate sealing reliability.
UNIVERSAL ENGINE SEALANT - Trusted worldwide for gas, diesel engines, and automotive applications.
EXTREME ENVIRONMENT READY - Resistant to combustion products, oils, coolants, and harsh weather conditions.
MULTI USE INDUSTRIAL STRENGTH - Ideal for pumps, manifolds, gearboxes, and high-voltage outdoor equipment.

Valco 71283 Blue Hylomar is a 100g industrial-grade, non-hardening sealant designed for metal-to-metal contact. It offers superior resistance to temperature fluctuations, moisture, oils, and combustion byproducts, making it the go-to choice for automotive and industrial sealing applications worldwide.

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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¥13338

Duties & taxes included

In stock

Sold byAmazon JapanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Japan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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