Arrow piece nearly done

This aluminum piece is nearly finished - I've just got to construct a proper base for it. Even with a piece of granite mounted in the bottom, the footprint is too small for safety and a medium wind would blow it over. The dimensions of the arrow are: 61" H x 13.25" W x 4" D. It is all aluminum held together by 200 galvanized steel screws. Like previous pieces of this type, it is painted, roughed up with coarse steel wool and clear coated. Next up: finish the two stones that are waiting . . .

Oops!

Well, here's some useful knowledge. I used to work with 2-component urethane foam, and although it achieved 30 times it's original volume, the action was all over in less than 5 or 10 minutes. I'm here to tell you the insulating foam you can buy in a can is different stuff! I foamed the interior of my aluminum piece pictured above because the seams were starting to separate. I thought that the foam would adhere to the aluminum and hold the piece together without my having to add screws or rivets. I knew there was going to be trouble after a couple of hours because the stuff was still increasing in volume - I should have scooped it out then. By this morning - well, you can see in the right photo that it spent much of the night getting bigger and bigger. It has stopped now, but it pushed out the sides and separated a couple of the seams so the piece will never be right again.
Guess I should have done a bit of testing . . .