I've used both the Fusor brand and 3-M and they both seem to work fine . The 3-M stuff will set up a bit quicker with a little heat so when I glued on the bed pockets too the new sides, I clamped it all and then spot welded the edges (just incase) . I used Fusor on some patch's on the cab and for the 14 gauge firewall cap. This smoothed off the firewall with very little filler and no distortion from heat . BTW , this stuff is moisture resistant so rust shouldnt start at the seam , try it !
