I redid my trunk with the black-aqua trunk spray in August. Don't forget to put a clear spray on top of the black-aqua when it dries.
>>This was the brand I used: http://www.ebay.com/itm/1964-1977-GM-TRUNK-GRAY-WHITE-SPLATTER-PAINT-SPRAY-CAN-/350576439702?pt=Vintage_Car_Truck_Parts_Accessories&hash=item519ffbf196&vxp=mtr#ht_1273wt_873 I did not put in a rubber trunk mat again as they hold in moisture. I went to Home Depot and bought a roll of indoor/outdoor carpet and cut it to fit the trunk.
Here's a link when I did mine. Has the paint further down in the thread too. http://www.v8buick.com/showthread.php?230862-Feeling-good-about-my-trunk-repair&highlight=