Originally Posted by DanTwoLakes
A picture of the area in question would help.
Not sure these will be of help for the question about butting foam...but here goes.
The first photo is of the general area of the rear compound/complex corner curve. Panel/section A is a separate piece that comes out separately from the upper portion of the curve (this was necessary to clear the seat belt mounting tab shown at the base of the curve). Sections B & C of the foam are the crux of the matter. They would be glued to the same backing board. I simply wanted to determine if the joint between these two foam pieces can be butted without it telegraphing and if so, any particular tricks for accomplishing that.
This second photo is a close up shot of foam sections B & C noted above and the arrow points to the potential butted seam between these two pieces.