Pro tip: Run the GDP E309 on the higher end of the amperage range (DC Reverse Polarity). It encourages the slag to curl up behind the puddle rather than entrap itself in corners.

Honesty is critical. The GDP E309 is not "better" in every scenario:

A custom automotive shop tested 5 brands of E309 on a turbocharger manifold (heat cycles between ambient and 1400°F).

The shop owner noted: "The GDP rod wets out flatter than the rest. It flows into the toe of the weld rather than crowning up. That smooth profile prevents stress risers. It is simply better engineered."