Thick door coating?

[nucknoel89]

Hi all, I've been doing door repairs and after wire wheeling away some of the paint I've noticed some thick coating on the metal. At first I thought it was body filler, but it seems to be over the whole door and I've seen this on 2 different doors. I've not seen this on any other body panel. If this is common, what is it and would it be fine to just clean it all off?

[VileZambonie]

pix?

[nucknoel89]

pix?

I'll try and take some in the morning

[nucknoel89]

One side is the door, the other side is the patch piece from a different door.

[jg1977c20]

mother cigrit that looks ...okay well i see sealer , primer , more primer ,bondo on the right and left

[Blazin]

Looks like body filler to me.

[FlatBlack77]

Looks like body filler to me.

[Blazin]

I use old hoods, doors, etc. to make a lot of my patch panels. I always grind them down to just about bare metal before I cut, bend, or weld to the vehicle being repaired.