I have one window frame that has a broken weld on the top piece. I purchased some of that durafix product and have tried unsuccessively to weld the joint back together. I cleaned the joint very well with solvent and tried. I cleaned the durafix back out and created a channel for it to flow into. I tried cleaning the durafix out of the channel I created and used flux to try again. All attempts have failed. The last held the longest... I re-buthayled, installed the gaskets, and got it back in the opening, only to have it break when I opened the operator. I do not know what to do now... I wasted about three hours in the last attempt. Is the right thing to do is take it to a welder? The original joints look like they were just soidered. I read that the frame should be hot enough to melt the rod when it touches and was able to acheive that....