piclex vs loctite extends

No, they are totally diffferent products. See the tech sheet for Picklex and the one for Extend (a pdf file). Picklex is a phosphoric acid-based product and Extend is a latex-based product. I've used Picklex to preserve clean bare metal prior to priming. I think it also can be used to remove light flash rust but I have used other products for that instead of Picklex. I've used Extend on heavy rust (tightly adhered) on items where complete rust removal was not feasible for me. I think the first instance is not appropriate for Extend and the second is not appropriate for Picklex. BTW, Permatex is now under the Loctite corporate umbrella and their "Rust Treatment" (available at NAPA) is the same stuff as Extend. Extend is best applied with a foam throw-away brush (not sprayed). If you should use it in a spray gun, make sure you completely disassemble and clean the gun immediately after spraying. Any remnants of the extend left in the gun will be next to impossible to remove later. Extend is available in rattle cans but I don't like the thin application you get with that method. Brushing it on seems to provide a much better film build. Brush Strokes can be a problem but that is minimized with the foam throw-aways.

PS: Depending on your screen resolution and browser you may not be able to read the Picklex link. If that is the case, try a mouse-over and see if you get a "full size" icon to click on in the lower right of the image. I have to do that with IE 6 on XP. The original file is 640x806 in size and should be easily readable on a 1024x768 display resolution.

Rod