The link doesn't work for me.
The best/easiest way to use stripper is to use a 40 grit grinding disk and mar up the surface. Scratch it up real good but try not to get down to the metal. This allows the stripper to get under the paint and it bubbles up faster/easier. Apply one panel at a time, you don't want it drying on the panel. Allow it to set for 10-15 minutes after it has stopped bubbling....use a body filler spreader and scrape it off and reapply where needed. When you are done neutralize the stripper with laquer thinner and a scuff pad. Sand with no coarser than 180 and epoxy prime or etching followed with 2k high build primer.
If the panel is in good condition you can even sand with 320, red scuff it, then apply etching, followed with non-sanding sealer then paint
Back in the 90's when I started as a painters helper we stripped the F-Series pickups that were peeling using this method. The stripper we used was Delta-Formost. I've also used
http://www.kleanstripauto.com/ with success.