It seems that almost every review involves "soaking" items. How does this work on surface rust that cannot be soaked?

For areas that's cannot be submerged I have taken paper towels soaked in Evaporust and wrapped the part. Do a few layers and make sure there are no air pockets or that area will not be treated. Follow the paper towels with a layer of plastic wrap to keep the product from evaporating and again watch out for air bubbles. Inspect, re-soak and re-wrap every few hours. For heavy rust I hit the surface with a wire wheel first. The Evaporust Gel might be more suited to this method.

Will this be safe to clean steal scuba tank in side and help prevent rust

I'm a dive master and certified tank inspector. If you have rust in your tank you should have it professionally inspected. You "could" use this but if there is pitting or other dammage it would cripple the tank and potentially make it unsafe to fill. Not sure about any residue this might leave that could contaminate the air, so I would say probably better stick to tumbling to remove light rust. Your dive shop can do this or should know of a service center that can.

My metal is covered with sticky goo after I left evapo-rust on it. I want to avoid water rinse due to flash rust. how do you rinse this off?

With the evapo rust, you need to make sure there are no oils, grease, etc prior to being on the metal when you soak the evapo rust. Once you soak the evapo rust and the rust has been removed, the product has done its job. You do want to wash it off afterwards and dry it. To keep it from re rusting is another problem in of itself. We have a product called rust block that comes in either a trigger spray or aerosol can. Spray a layer of it on there and it will keep the object from re- rusting for up to a year

If I soak a tool, will it ruin a wooden handle (like a chisel)?

I have soaked many old tools with wooden handles with little change to the wood. Given that “wood doesn’t like water”, I try to keep the soak time as short as possible. I rinse and rub with fine steel wool. I dry with a hair dryer to prevent rusting. Final step is light oiling. I hope this process works for you. Also, I keep the “used” EvapoRust and reuse many times.

ASIN	B00M0TLQ66
Best Sellers Rank	#3,015 in Automotive ( See Top 100 in Automotive ) #4 in Care Corrosion & Rust Inhibitors
Brand	Evapo-Rust
Brand Name	Evapo-Rust
Contains Liquid Contents?	Yes
Customer Reviews	4.6 out of 5 stars 12,690 Reviews
Global Trade Identification Number	00899303000011, 00899303128043
Included Components	1 container
Item Form	Liquid
Item Type Name	The Original Super Safe Rust Remover, Water-based, Non-Toxic, Biodegradable, 1 Gallon
Item Volume	3780 Milliliters
Item Weight	8.65 Pounds
Item form	Liquid
Item volume	3780 Milliliters
Manufacturer	Evapo-Rust
Material Features	Non-Toxic
Material Type Free	Acid Free
Material features	Non-Toxic
Number of Items	1
Scent	Unscented
Special Features	Residue Free
Specific Uses For Product	Industrial Machinery
Specific uses for product	Industrial Machinery
Surface Recommendation	Metal
UPC	899303128043 899303000011
Unit Count	3780 Milliliters

Evapo-Rust ER012 Super Safe Rust Remover – 128 oz, Non Toxic Rust Remover for Auto Parts, Hardware, Antiques | Rust Removers and Chemicals

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