What should be the heat setting on the iron?

The setting on most irons should not exceed 2.5. The thermo glue designed for Concord 2000 has a low melting point. Since heat is one of the elements that contributes to seam peaking, we developed a thermo glue that would melt quicker than regular tapes.

Will the blades telegraph?

No. The stainless steel blades are absorbed into the thickness of the thermo glue.