A couple od days ago I sprayed the bottom of the doors on my P5d outside and with cellulose.They'd been done a long while back but the paint was a terrible match,I ordered some cellulose onlint,thinned it down and waited for a reasonably wind free day.At some time the whole cars going to have to be done due to micro blisters,in the meanwhile it looked a bit odd with the mis matched doors.
A few thin coats and a compound after a week or so and it looks lots better.I like celluose on an old car I think it suits them.