What should be done first when preparing a newly painted pinchweld?

When preparing a newly painted pinchweld, the first step should be to use glass cleaner. This is essential because it ensures that the surface is free of any contaminants, such as dust, grease, or residues from the painting process. A clean surface allows for better adhesion of the adhesive that will be applied later, thus ensuring a more secure bond between the glass and the pinchweld.

Using glass cleaner effectively prepares the surface by removing any substances that could interfere with the bonding process. It sets a solid foundation for subsequent steps, such as applying adhesives or primers, which are necessary for optimal installation.

Other steps, like inspecting for rust, might seem logical but typically follow the cleaning process because if the surface isn't clean, any inspection or additional treatment may not be effective. Scuffing the area and applying any products like SP-207 are also critical but come after the surface has been prepared.