Okay, i have here an 84z. the pictures show two problems i have with the front bumper cover and chin. the chin is split into two pieces... can i repair this? and the bumper cover has a small split in the corner at the grill. are the repairable? and how should i do it? i would like to try the repairs myself.

 

Your picture's didn't turn out. Lets see how bad it is.

 

lets try this...

 

3M sells a flexible plastic repair epoxy that works well (I repaired some pretty big tears on my front bumper). Just make sure you use it along with the proper plastic cleaner and adhesion promoter.

 

Almost any two part epoxy will work, haven't had any crack in the curves area on mine.
But I have fixed a few smaller cracks with two part epoxy. Works great.

 

okay... I'm new to this... whats the adhesion promoter for? Is it so the apoxy adheds to the bumper?

 

yes. It's used any time you want to make anything stick to bare plastic

 

They sell "Bumper Repair Kits" at auto body stores. It's basically an epoxy with a mesh for reinforcement. I've used one to successfully repair worse damage that you have.

 

Try and repair from the back side, so you don't have all the epoxy on the front. Get the 5 minute set. Anything longer will be a pain holding it in place while it dries.
Stuff really works! take your time and do it right.

 

The 3M products involve using a reinforcing behind the repair if possible and 'V'ing out the crack so there is plenty of space for the material to adhere and using the proper cleaner and adhesive promoter.
Hot Rod or Car Craft has a nice tutorial on the subject I think...
I have a split in my chin spoiler that I am going to try it on.