Paint rust and weld

[HeavyMetal]

Who can answer this for me as im always curious about this?

Why when i have 2 pieces of bare metal welded together, does it always rust at the weld after painting?

I can lay 6 coats of primer/paint/clear on this and the weld ALWAYS rusts through first. why?my subaru lightbar has 3 coats of primer, 3 coats of paint, and 1 of clearcoat, and even on that piece the weld area is rusting through all those layers. tis is without pre existing rust. bare clean metal.

goes without saying on steering and such as well.

WTF. the northeast is fail

[Quartney]

its because your jeep is green

or its jsut murphy smiting you

[HeavyMetal]

sounds 'bout right.

[mrjeeperz]

do you sand or lightly grind clean the welds before painting them?

[HeavyMetal]

on the light bar yes definitely

[mrjeeperz]

id say sand it better maybe..? paint it on with a paint brush..!

[HeavyMetal]

i was thinkin about actually just using human blood next time

[mrjeeperz]

that could work. or use some POR or any other rust protectant paint they sell

[Quartney]

do you need suggestions of what humans to sacrifice?

[HeavyMetal]

do you need suggestions of what humans to sacrifice?

nope my list is all squared away thanks though

[Quartney]

frick

[Pedro]

i would try POR-15. you can get a little can for 20 bucks

[ninetysix-ex-jay]

Rusty welds might have something to do with trapped oxygen inside the weld bead and the weld is not exactly a pure metal. Try using a rust sealer or something like POR 15 if you want to pay that much

[Scottmc01]

slightly off topic, but word is there's a POR shop in Meriden and you can go in and buy dented cans and reject stuff they can't sell to distributors. Anyone know about this or where exactly it is?

[grundlepunch]

i notice this as well Will, luckily just about everything under my jeep has been re welded in the past year or 2 so it looks like a fucking rust bucket.... i also painted with rustolium