Stain on straw bale wall
Hi All!
Hoping someone here can give me insight on a straw-bale insulated wall that I am limewashing. This rusty stain keeps seeping through each coat of limewash (I'm two in coats so far). I have zero experience with this - just did some YouTube research before starting. If it was a normal paint job i would just put a coat of Kilz on it and move on with my day, but my understanding is that breathability is key for maintaining a wall with straw.
If it helps for context, I suspect that the previous homeowners may not have applied a limewash final coating when they built the wall as you could still see pieces of straw embedded in the surface of the wall before I applied limewash. I'm very happy with the finish so far except for this stain. Thoughts?