Dark spots coming through unsullied paint.? My husband and I bought a 1962 travel trailer that was...

My husband and I bought a 1962 travel trailer that was within really good condition. There have been a prior bleed in the top front but someone fixed it, and replaced most of the front bring to a close. Despite its great condition, the previous owner had painted everything insubstantial yellow and dusk yellow (my least possible favorite color) So we decided to paint it white. We started by fine art a layer of oil-based kilz, after my husband sprayed it with a semi-gloss white paint (Behr) and a paint sprayer. When he finished we notice a bunch of tiny dark colored spots surrounded by different areas of the trailer. (there were no grades there when it be painted yellow) Then he rolled it with indistinguishable paint, because he missed some spots, making sure to cover the spots. But again they came through. I am worried that it may be mold, but why didn't it show through the pale paint? Or the kilz? And wouldn't the kilz have stopped it if it be mold? Any suggestions? Thank you for your time!
if you want to get rid of the spots buy some spray shellac two flimsy coats, primer, paint good to run you can get it at hd or lowes


Mold is gross but killz (if applied properly) should have kill it. Perhaps it's rusty nails or staples that are starting to bleed through the paint?

don't transport chances, grasp a mold kit at home depot and transport it in for trialling.
Answers:    maybe you didnt see the grades because it matched the paint color?? it sounds like any mold or some kind of oxidation, is it metal ? if it is metal afterwards its oxidation and kilz will cover some but not all oxidation, i scholarly from trial and error that sanding and scour with steel wool along beside several layers of kilz is the lone way to really preserve oxidation at bay.
If its not a metal surface next you could be right that its mold - and kiltz is known for its talent to cover mold- but again from experience i learned - it really does not work on alive mold, but a good cleaning beside strong bleach and a few layers of kiltz is a flawless cover for mold. If you do determine its mold - its best to give it a couple of weeks to come through the tentative layer of paint- mold is a living organism and will want to find its agency through to survive either path - by having paint over it in actual fact protects it from being kill by bleach , so you have to dispense it time to pop back through formerly you apply the bleach. Also if you can place a dehumidifier in the trailer that will minister to to bring out and kill the mold.