heronfan

Hi everyone. Once my husband and I moved turned the spare room into a sewing room for me I put up a design wall. It's made from the insulation board from a well known home improvement center. I covered it with flannel.

I was working on a large project and as I completed each square and removed it from the board I took my pins and placed them to one side on the wall. That was a few weeks ago. Today I noticed that all of those pins are rusted where I left them. I took them all out and threw them away in a container I use.

It's been very wet and humid here in south central Texas but rust, really? Am I just using the wrong pins? I have had them a while but I never expected them to rust. The ones still in the uncovered pin container are just fine as are the ones in my pin cushion. Could it be from the insulation board?

Any ideas?