Curious about your old Monogram...I just so happend to have picked up a very old Monogram 1/48 P-40 the other day and the decal sheet seems to have seen better days. I'm expecting them to be a total loss because sheet is a bit yellowed, and the decals show some cracking.
Although, I see the newer Revell kit (Revell bought Monogram, right?) all the time so a replacement sheet shouldn't be hard to find. By the way, got any good links to buy some more? I'm thinking of checking Ebay.