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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71283 Hylomar Blue Gasket Marker and Thread Sealant Tube with Nozzle - 100 Grams

71283 Hylomar Blue Gasket Marker and Thread Sealant Tube with Nozzle - 100 Grams

Product ID: 20826441

Details

Brand
Valco
Item Weight
3.84 ounces
Item dimensions L x W x H
7.48 x 1.18 x
Material
metal
Style
Industrial

💧Water & oil resistant sealant

🔥Resists rapid temperature changes

🛠️3.5 oz precision tube

¥5630

Duties & taxes included

In stock

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Description

🔧 Seal like a pro, perform like a legend.

TEMPERATURE WARRIOR - Withstands rapid temperature swings without cracking or drying out—built for extreme conditions.
MULTI FLUID RESISTANT - Defies combustion products, petroleum, lubricants, coolants, and moisture for long-lasting protection.
UNLIMITED ASSEMBLY TIME - Work at your own pace with a non-hardening formula that never rushes you.
VIBRATION PROOF RELIABILITY - Maintains integrity under constant vibration—ideal for automotive and industrial applications.
UNIVERSAL METAL TO METAL SEAL - Ensures flawless surface contact and seals imperfections for peak engine performance.

The 71283 Hylomar Blue Gasket Marker and Thread Sealant is a 100-gram, non-hardening, vibration-resistant sealant trusted worldwide for gas and diesel engines. It offers superior resistance to temperature fluctuations, combustion byproducts, water, oils, and coolants, making it perfect for sealing metal flanges, pumps, cylinder heads, and more. Its unlimited assembly time and durable waterproof formula ensure professional-grade sealing with every use.

Specifications

ASIN	B00CFH9GZG
Best Sellers Rank	#48,668 in Automotive ( See Top 100 in Automotive ) #50 in Gasket Sealers #254 in Engine Tools
Brand	Valco Cincinnati
Brand Name	Valco Cincinnati
Compatible Material	Metal
Customer Reviews	4.8 out of 5 stars 566 Reviews
Item Dimensions	7.48 x 1.18 x 1.97 inches
Item Form	Liquid
Item Weight	100 g
Item dimensions L x W x H	7.48 x 1.18 x 1.97 inches
Manufacturer	Valco Cincinnati
Material	metal
Material Type	metal
Model	710XX283
Number of Items	1
Number of Packs	1
Part Number	71283
Style	Industrial
Style Name	Industrial
UPC	042864033596 191215144747
Unit Count	1 Count
Warranty Description	No
Water Resistance Level	Water Resistant

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TrustScore 4.5 | 7,300+ reviews

Anjali K.

The product quality is outstanding. Exactly what I needed for my work.

1 month ago

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Fast shipping and excellent packaging. The Leatherman tool feels very premium and sturdy.

1 day ago

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¥5630

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

Trustpilot

TrustScore 4.5 | 7,300+ reviews

Ravi S.

I loved the variety of products available. Will definitely shop again.

2 months ago

Vikram D.

The MOLLE sheath is of exceptional quality. Very happy with my purchase.

2 weeks ago

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