Normally the "white" paint will be Kilz or a Kilz-like product designed to hide not only old odors, but also old staining. The odor is sometimes overwhelming that the homeowner just can't get it out of their nose until the entire attic is painted, even though it may not have been directly effected by the fire.

On the other-hand, a "silverish" colored spray on (aluminum impregnated) paints are what is what you will usually see for a home that has had a spray-on thermal barrier for energy-efficiency.

There is only a slight difference in the looks of the two but if you have had the opportunity to see very many of each, they are quite distinguishable.... Hope this helps.

RR

__________________
"If con is the opposite of pro, is Congress the opposite of progress?"
Richard Rushing, HCRI
Duncanville, Tx.