Too long?

[Iwsbull]

I was doing the shake and bake method but have started putting my container in my tumbler and by the time I get everything set up and ready they have been in for 20 minutes or so. Usually they look really good with a nice good coating. I then set the next batch in to tumble as the other batch cooks and so on.
Today I had to take off as the one batch coated and the other cooked. 2 1/2 to 3 hours later the powder that I was coating with has changed color and when cooked was rough and much darker than normal. Back in the pot they go.
Anyone else had this happen?

[Conditor22]

The longer they are in the tumbler the darker they will get ----- lead.

5 - 10 min should be more than enough.

[NyFirefighter357]

The longer they are in the tumbler the darker they will get ----- lead.

5 - 10 min should be more than enough.

This is what I do

[fredj338]

I shake for less than 1m. I can't imagine any benefit from running them in a tumbler for much more than 5m.

[Dragonheart]

Basically you have lead dust in the powder. Most tumblers are too aggressive to begin with and the reason I modified mine so I can adjust the level of vibration.

[sv44]

i put mine in a #5 container , then in the tumbler (careful to make sure the twist of the container is opposite of the direction it tumbles). tumble for 3-5 min (after doing it initially for 20 -same issues as OP). seems to be better and more consistent.

[Iwsbull]

They were in a #5 container setting in my media so it softened the impact.