Floor pans sealer and primer

Last week I used the short stand fiberglass filler on the underside of the floor pans around welds and seams. I ended up ordering a good full face respirator after I found out how bad the fiberglass is to breath and how easy it gets in your eyes.

I tried a few tools to sand back the filler. A oscillating multi tool with a triangle sanding pad, a rotary multi tool with a 2 inch roloc sanding disc, and an angle grinder with a flap disc. I did the majority with the angle grinder and the rest with the rotary tool. Very messy job. Then I had to vacuum the floor and used a brush tool to vacuum the floorpan underside and inside the car.
I reprimered/sealed the underside of the pans.
After a vacuum and acetone wipe of the seams I started using the seam sealer on the inside of the floorpan. I think I got a defective product because even after punching a massive hole in the caulk tube seal and opening the application tip to a quarter inch it took all my strength to just get a little bead. It just did not flow. I heated it up in hot water and once it was out it felt like normal consistency of caulk but it just wouldn't squeeze out. I spent 3 hours fighting with it and got about half the interior done. I was really hoping to get top coating with por15 tomorrow but I doubt it. I will finish the seams, clean and top coat the engine bay.

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