Run away fast.  That stuff is nasty.  I use flaked carnauba wax per a recommendation from Walt Melander of NEI fame.  Available on eBay or Amazon among other places.  I light it after sprinkling some on the melt and let it burn.  If I am lucky, I will have remembered to take down the paired smoke detector that goes off in the garage as well as the shop where I am casting in front of an open door with a fan blowing out.  If I forget about the detector, the family comes running after the one in the attached garage goes off. 

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   I have been using Marvelux for ten years or so and have no problems with it. It works well and produces little smoke which is important to me. I used to use a bit of beeswax but the smoke made it impossible to flux inside without opening windows and using fans, not too practical in cold weather.

Marvelux flux rusted me pot. I use old bullet lube. I use a striker to set it on far which burns up the smoke. I never cast bullets in the house. Don't think the fumes er good fer ya.

I've been using it for many years too.  I can't compare it to anything else because I haven't really tried anything else.  My Lee pots have a little surface rust on the top but they've been in service a long time.  

Maybe I'll give those flakes a try and see how it compares.

Chris.

Nothing but old candles for the last 70 years of casting. Ignite the smoke.
Tried Marvelux flux. the parrafin candles work better
to re alloy the dross tin back into the alloy.
beltfed/arnie

Smoke,
I have an opinion on this that you can ponder... 
In the past I have had access to, and used a lot of range lead, several tons of it anyway.  I do prefer using Marvelux for the melt that is really dirty, but don't use your regular lead pot...
I use a cast iron pot on a cheap propane burner out in the middle of the yard.  Melt all that dirty stuff, flux heavily, pour into ingots, Then use wax to make your mix with tin - in another pot if needed.  I found a cheap cast iron pot made in the far east,  I stamped "used for lead - not for food" in the bottom of it.  Just be careful not to load it heavier than you can handle, ask me how I know that...
GT

cast off bullet lube, pieces of paraffin, and old candles is the extent of my flux, and I can't tell any difference in the finished metal but the amount of smoke and fire are a little variable. of course, that may be due to the size of the flux load in comparison to amount of lead- or maybe the temp.
what I am really posting for is to ask you sawdust users if you just use that on bottom pour pots? I can't quite figure using a dipper thru a layer of sawdust and getting any decent bullets molded. tell me how that works if you do it that way, please.

I've always used bees wax to flux, and smoke isn't an issue as I never cast indoors, and never would. I cast in the doorway of my shop with a fan setup to blow any fumes or smoke away.

Smoke wrote on Apr 18^th, 2026 at 1:22am:


For the scrap lead I use TWO pots.  Melt and flux (borax) skim whatever I can off the top. Then pour that into the second pot, skim.  Reheat and pour back into t he first pot.  It's fast and gets the alloy cleaner than just stirring.  Also I use a weed burner to heat the alloy on the top with the turkey fryer underneath - really speeds it up.

I have used a piece of channel iron at a 30 degree angle to allow the melted alloy into the pot, leaving the crud (wheel weight clips etc.) in the channel.

for the pot used to cast with I use a hardwood scrap to stir with.  It keeps the inside of the pot clean even though I use borax.

Well, whatever the reason your dump was closed, it makes me want to ask how do you like living in a town that saves its garbage?