How to repair the plastic Mehari body |
There's a lot to tell about repairing a ABS (that's Acrylonitrile-Butadiene-Styrene for friends) body.
ABS is a thermoplastic which means the plastic gets soft when heated (and melts when you're exaggerating :-)As you'll see, this is kind of an advantage to do our repair !
Another thing about ABS is that it can be dissolved. The best solvents you can use are Acetone and Methyl-Ethyl-Keton (MEK or MEC). I used Acetone.
My car had about all the possible damages a Mehari can get, so here is how I did it :
How to....
Make some ABS putty
Repair a crack
Repair a small hole
Repair a big hole
Fixing bent surfaces
The ABS Putty
Cut some ABS (I used the old Mehari nose. It became the perfect donor) into small chips (eg 2mm x 2mm). Put them in a glass jar with a good lid (I used an old marmelade jar). Add some acetone (not too much) and stir it with some non-dissolvable item (I used an old kitchen knife), until the chips are completely dissolved. This will be your putty to use. Be careful, acetone is highly flamable ! Also, close the jar tightly after use since the acetone evaporates quickly. If this would happen, just add some acetone and start stirring again. It can be done over and over again.
You can make the putty very sticky (little acetone) or very liquid (more acetone) as you see on the picture below.
Repair a crack
Start by sanding the broken surface on both sides. It should be very clean !
Repair a small hole
This goes much faster. You need some liquid ABS-putty and a piece of ABS. Again, start by sanding the damaged region on both sides. Also the piece of ABS we'll stick on the hole should be sanded. This method works for holes with a size of some centimeters.
Theory | What to do | What it looks like |
This is the hole | ||
Find yourself a donor piece and make it larger
then the actual hole. Here's doctor José cutting out the donor piece for me. Thanks José ! The man on the left is Kristof, his Mehari is on the background. Go to the gallery to get a closer look |
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(drawings don't show backside supporting pieces) |
Cut the hole and the donor piece till they fit. Glue some ABS pieces on the backside so that they'll support the donor piece | |
(drawings don't show backside supporting pieces) |
For big holes, you can't use the
'put-acetone-on-both-sides-and- glue-it-together-technique', since the acetone evaporates
too quickly. I applied putty on the supporting ABS and put the donor piece on it. (By
mistake, I cut my donor piece in three so I had some extra work to do). To fill the remaining space, I used the 'dripping technique' since that putty won't have to support anything. It's just for filling. Sanding afterwards of course |