Can this be used for valve cover gasket sealant?

I have used it to seal a gear box gasket. No reason why it can't be used on valve cover gaskets.

Can this be used to repair a failed freezer gasket or would it be too stickly and just fail during use? (Failed corner, 12 year old fridge)

I find this to be a very interesting question. I cannot however, say for certain but, once it is fully cured it doesn't seem tacky at all so I would have to think it would work. Your freezer is going to be down for some time though as you would have to leave the door open till fully cured. Make sure you build the bead up to be even with your gasket on the first try. What do you have to loose other than a couple bucks versus a new gasket or new freezer. I would certainly try it.

Can I use it for quick fix on rubber refrigerator door gasket

If you are using it as an adhesive, It should hold the refrigerator gasket. It will not work as a gasket... unless you do not want to open the door ... I use it as a flexible glue type substance and/or sealant.

Can I use this on reparing the seal inside the speed oven?

For that application you want to use the high temp version (Red). Just search for permatex hi temp RTV. It has a maximum temperature of 650°

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Permatex 82180 Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker, 3.35 oz. Tube, 2 Pack

Product ID: 2598116

Details

Color
Black
Material
Silicone
Brand
Permatex
Item dimensions L x W x H
1 x 4 x 4
Included Components
ITW Permatex -

📦2 Pack

⚙️Silicone Material

🛠️Oil Resistant

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Description

🔧 Seal the Deal with Confidence!

EASY TO USE - Squeeze tube design for precise application without mess.
FAST CURING - Sets quickly, allowing for efficient repairs and less downtime.
VERSATILE APPLICATION - Perfect for automotive, marine, and industrial uses.
MAXIMUM OIL RESISTANCE - Engineered to withstand extreme conditions, ensuring a durable seal.
HIGH TEMPERATURE TOLERANCE - Withstands temperatures up to 500°F, ideal for high-performance environments.

The Permatex 82180 Ultra Black Maximum Oil Resistance RTV Silicone Gasket Maker is a high-performance sealing solution designed for a variety of applications. This 3.35 oz. tube, sold in a convenient 2-pack, features a durable silicone formula that provides maximum oil resistance and can withstand extreme temperatures, making it perfect for automotive, marine, and industrial uses. Its easy-to-use design ensures precise application, while its fast curing time minimizes downtime for repairs.

Specifications

Color	Black
Material	Silicone
Brand	Permatex
Item dimensions L x W x H	1 x 4 x 4 inches
Included Components	ITW Permatex - 82180 - 2/Pack
Number of Pieces	2
UPC	798304318463
Manufacturer	Permatex
Part Number	82180-2
Item Weight	7.8 ounces
Product Dimensions	1 x 4 x 4 inches
Item model number	ITW Permatex - 82180 - 2/Pack
Is Discontinued By Manufacturer	No
Style	3.35 oz.
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No

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