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MARVELUX® BULLET CASTING FLUX Reviews & Ratings

MARVELUX® BULLET CASTING FLUX

The Brownells MARVELUX® Bullet Casting Flux is a premier choice for both professional and hobbyist bullet casters, effectively reducing dross formation and enhancing the fluidity of bullet alloys. Introduced in 1971, MARVELUX® has been a trusted flux in the bullet casting community. Its non-corrosive nature ensures that iron and steel equipment remain free from rust, and it does not produce fumes that can cause corrosion, unlike sal-ammoniac-based fluxes. Regular use of MARVELUX® keeps casting pots clean and rust-free. Additionally, it is non-smoking, flameless, and odorless, providing a safer and more pleasant casting experience. MARVELUX® is superior to traditional fluxes like beeswax, tallow, paraffin, and rosin, as it doesn't emit unpleasant odors during use.

Key Features:

Non-Corrosive: Safe for iron and steel, preventing rust formation.
Fume-Free: Does not emit corrosive fumes, ensuring a safer casting environment.
Reduces Dross Formation: Enhances the fluidity of bullet alloys for better fill-out.
User-Friendly: Non-smoking, flameless, and odorless, improving the casting experience.

Specifications:

Available Sizes: ½ lb. (8oz / 226g), 1 lb. (16oz / 453g), and 4 lb. (64oz / 1.8kg) jars.
Application: Suitable for any lead alloy melt intended for casting bullets or swaging cores.

Incorporating Brownells MARVELUX® Bullet Casting Flux into your bullet casting process ensures cleaner melts and higher-quality bullets, making it an essential component for achieving optimal casting results.

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3 Stars

2 Stars

1 Stars

17%

Reviews Summary

Customers praise MARVELUX® BULLET CASTING FLUX for its effectiveness and minimal smoke compared to other fluxes. Many have long-standing experience with the product, appreciating its ability to clean and improve the quality of molten lead. However, some users express concerns about moisture attraction and rust, suggesting careful handling is necessary.

What Reviewers Are Saying

Effectiveness

80%

Reviewers consistently highlight MARVELUX's effectiveness in cleaning lead and removing contaminants, often stating it's the best they've used. Many claimed it excels at producing smooth alloys without igniting or creating significant smoke, making it a favored choice among experienced casters.

Smoke and Odor

65%

A significant theme across reviews is the low smoke production and pleasant odor of MARVELUX compared to traditional fluxes like beeswax. Customers appreciate that it doesn't create a foul smell or heavy smoke during use, contributing to a better casting experience.

Longevity and Value

70%

Many users find that a small amount of MARVELUX goes a long way, emphasizing its value and longevity. The product's efficiency means it can last a long time, making it economical for those who cast in large quantities.

Hygroscopic Nature and Rust Concerns

35%

Some reviews indicate issues with MARVELUX's hygroscopic properties, leading to potential rust problems if not handled carefully. Customers express that moisture absorption can cause sticky residues, prompting caution in storage and usage.

User Experience and History

50%

Long-time users share their experience, with some having used the product for decades. Their insights reflect strong loyalty and satisfaction, while also considering the mixed opinions existing within the casting community regarding its handling and potential drawbacks.

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Good stuff

First, it seems far better than the previous flux I got from another supplier. I had gotten a used cast iron pot that the previous owner fluxed with candle wax. There seem to be some sort of build of something other than lead. This flux not only cleans lead better than the other commercial/chemical flux sold at other shooting supply houses, but also did a lot to clean off the build up on the pot interior. It will be added to next order along with other reloading products.

Would you recommend this? Yes, I would recommend to a friend

Great flux

This is the only flux I use. Have used this for over 30 years with no issues. Easy to use and effective in removing the contaminants in the melted casting metal.

Would you recommend this? Yes, I would recommend to a friend

by LARRY K. on June 02, 2024

Verified Purchase

Was this review helpful? 1

Great people, and top quality.

im melting recovered range lead. lots of oxides and nitrides. marvelux in any size is the only thing that really cleans things up. and unlike other products marvelux has almost no smoke and it for some reason inhibits rusting of steel and cast iron melting pots. the only down side is that if you leave the lid open it will draw moisture .but it floats on molten lead so theres no explosion. it still works just fine.

Great stuff!!

Great Stuff! Have used this product for years. No bad smells, smoking, and on.

Doesn't Stink!

First, I did get a little smoke; but I can't say it wasn't due to a foreign material in the lead. The good news is it doesn't stink up the area like wax or sawdust. It does take a while to finish reacting (it fizzes) but it leaves the alloy SILKY smooth. I don't know if it's the best out there, but it's definitely the best I've used. Give it a shot.

Be careful

If you absolutely need something with minimal smoke/smell, Marvelux works OK. Be very careful though, as it is seriously hygroscopic (attracts moisture) and leaves a sticky, glassy residue that's hard to get rid of. I had bad rust problems when I used it, and threw away the rest of the can. I think it can work ok if you're very careful how you use it, but many/most serious casters hate it with a passion. If you don't believe me do a search on cast bullet forums. I'm far from the only one who's had problems.