About rust

[mhorowit]

Take a piece of 4130 tubing and remove the oxide to bare metal. If I leave it in the house it will remain clean. It may not be as shiny as when I hit it with the emery paper, but it's certainly doesn't have 'rust' as if I had left it out in the rain overnight

When my A&P and I we were discussing sandblasting and priming, he wanted the work in the priming booth within two hours of sandblasting.

Question: Is there a visual indication oxidation has occurred and has to be removed prior to priming? - MIke

[Robert Lees]

Re: About rust

Any delay is too much, but your A&P is about right.

When I had a bunch of blasting to do, with potentially several hours between blasting & painting, I put blasted parts into a large plastic bag with a few of those large 2 lb bags of fresh silica gel.

I could then blast a few more parts & add them to the bag until I was fed up with blasting and move on to priming.

[Ragwing nut]

Re: About rust

He is correct in that the sooner the better. I have had to wait over 24 hours before, although I try to prime asap. Blasting basically opens up the poors of the metal and becomes vulnerable to oxidation which starts immediately. Any finger prints or oxidation spots should be scuffed and the whole part should be wiped down to remove any oils left by body parts during handling.

Mike