Duramix is the Answer for Dash Fabrication!
Well I have been working on fixing my dash panel this weekend, and I have to say that Duramix is the answer for a plastic to plastic bond. It is basically a 2 part liquid plastic in a tube.
I bought the stuff from Levine auto. It is 27 a tube. They want like $60 for the gun to use it. Since I was not about to pay $60 for a tool I had limited use for I went to lowes to see what I could come up with. I bought the biggest cheap caulk gin they had for about 8 bucks. I then bought a piece of 1 inch dowel for like $4. Whoala, a duramix caulk gun for $12. You just cut the dowel into about 6 inch pieces and use then to push the material. You have to cut the corners off of the base of the duramix tube so that it will fit in the gun easier.
I would recommend buying one tube of Duramix 4040 and one of 4058 and at least 12 mixing tips for the 4040. Each time you want to apply the 4040 you will have to use a tip. I unfortunately bought 2 tubes of 4040 and no 4058. The 4058 is a skim coat that you will need to fill in holes with.
Since I don't have a DA sander and was using my dremel free hand, I am going to need a lot of 4058 :)
4040 bonds VERY quickly.
I am going to include a picture of the duramix gun I made. I am not putting a picture of the dash piece in because it is far from done and I have painted it so that I can use it in the truck this week. I am working in Atlanta and my house is in Charlotte, where I do the work on the truck and stuff so it is only on the weekends. I just ordered a tube of 4058 and I plan on working on that next week.
Let me know if you have any questions.