Finish the Glass (7)
As with resin, mix up small batches of filler as you'll only have 5-7 minutes working time before it begins to harden. Unless you have an unusually large area to fill, a gob the size of a golf ball is about right. Plop that down on the filler pallet and add the hardener cream. You only need enough to slightly change the color, for a golf ball size add about 1/2" out of the tube. Mix this together thoroughly using the thin putty knife to scrape filler off the pallet and fold it over what is already mixed. Do this as quickly as you can, use the next larger putty knife to scrape off the small one and add that back into the mix. Once the two parts touch the chemical reaction of hardening starts immediately, you have 5-7 minutes before it becomes unworkable. Using the putty knife that is larger than the area to be filled scrape some filler off the pallet and apply it to the body. Try to get the filler in the center of the putty knife as it will spread wider as it's applied. Drag the putty knife over the prepped area, at about a 45* angle. Let the outside edges drag on the body to assist in setting the height of the applied filler. This is a real help if you're filling a door to match gap heights as one side of the knife will drag on the fender setting the filler height. Use the edge of the smaller knife to remove excess from gaps and bumper seams.
Spread it on as smoothly as you can, remove any excess around the edges. Smaller areas can be filled with the smaller putty knives. Use one knife against the other to gather left over filler into the middle of the knife for the next spot. Use the least amount of filler possible to fill the low spots, you want to leave it a little bit high but not much. The more you put on the more you have to sand off. Once the filler gets so thick you can't spread it, stop. Clean the tools by scraping off the excess, one knife over the other. Scrape the pallet clean too. A little lacquer thinner on a shop towel works great to clean the final residue. Use the edge of the putty knife to flatten or remove edges of filler that spill into door gaps or bumper gaps while it's still soft. It will be much harder to get that out of there after it hardens. Mix up the next batch and keep going until all spots are filled. Let the filler dry completely and cool down, takes about an hour.
Photo shows the rear bumper filler application and tags left on after filler was applied. More on this rear bumper area later......
Tips: You want to do filler work at the lowest levels of the substrate possible. Extra time here is warranted; however, your going to miss some spots. I'll show you how to fix those after the first primer makes them more visible.