I'm dealing with an old exterior door that has several hardware holes. My plan is to mix it and then put it in the bottom of a baggie, cut a hole in the corner, and squeeze into the hole — right about that? But should I fill it half and do a second fill? And then maybe, keeping the second fill just shy of the door surface, do a third coat, very smooth? This plan makes sense to me, but how does it seem to you? Any pitfalls?
I would just mix up a small amount and use a putty knife to patch the holes. You're going to have to apply two or three coats if the holes are deep. This wood filler doesn't shrink much, but you have to build up the layers until it's level with the surface. You could use the bag to squeeze it out, but I think using a putty knife is faster and easier. You have to work fast with Bondo because it hardens in less than 5 minutes.
Updated on August 19, 2019
By Matt G.