My house has what looks like a rigid spray foam insulation on the exposed parts of the exterior surface of the foundation. Most of the exterior of the house is covered by brick or aluminum siding, but I have a slope from the front to the rear of the housethat leaves some of the foundation above ground. As far as I know, the use of the spray insulation is not really a problem. However, I am seeing two issues with the foam that I know are not right.
1.) The insulation was coated with some sort of sealing agent that has mostly worn away, and it looks like previous owner attempted to paint the insulation with spray paint, as the insulation has a pitted appearance in places from where the insulation melted/dissolved because of the solvents in the spray paint. (I did a small test with some spray paint she left behind and got the exact same results.)
2.) Where the insulation is not sealed or damaged from spray paint, it is starting to wear away from exposure to the elements.
Having never seen this done before but being assured by others that this was normal in my area (Minnesota), I have no ideal what is going wrong. Long story short, what can I do to fix this, up to an including removal and replacement with something else more durable?