I installed new full floors in my 69 Camaro. Then I wire wheeled the whole inside trunk and old floors area to bare metal. I then used the marine clean and metal ready and let them both dry .My Question is how long of a window do you have to treat it with the POR-15 paint? It’s been too hot to paint the last couple days and I’m waiting for a cooler day. Also now there is some surface rust appearing. Do I need to re-prep it?