Repairing A Crack on a Hard Plastic Littlest Angel Here's how I use Plastic Paste to repair hard plastic. My model is a Littlest Angel, a walker with stress cracks due to the walking mechanism. This technique can also be used to repair most hard plastic splits and chew marks.
Here's the patient. She not only has a crack but a broken out piece on the back of her hip socket.
Step 1
Cut a piece of the plastic blister display bubble. I rubbed it on a candle to get a surface I could be sure wouldn't stick to the Plastic Paste. I folded it in half to get some tension between the broken socket and the leg so it would stay in place while I worked on the crack. To be sure, I wedged a toothpick under the plastic. Putting the doll's legs in a sitting position makes working on this problem easier. If you were working on a knee joint, again, bending the knee would yeild better access.
Step 2
I only needed a tiny bit of the paste so I used a bottle cap for a pallet. I get the paddles at Sally's Beauty Supply. Take equal parts of the paste from each can using a clean paddle for each part. Mix the yellow and white putties together thoroughly.
Step 3
Using one of the paddles, push the putty into the crack and over the broken piece and out onto the piece of plastic bubble. With a wet finger, tamp the putty into the crack and smooth it out on the edges and over the bubble.
Step 4
Now trim the excess with a toothpick. Try as much as possible to match the curve of the socket.
Step 5
Use a wet finger and your fingernail to shape the mend into a smooth ridge. Put the doll where it won't be disturbed for the putty to harden.
Step 6
It's now 12 hours later. The putty is hard and feels like plastic. Bend down and pull out the plastic bubble from under the cured putty.
Step 7
Now the really important part - sanding. Sally's Beauty Supply has nail shaping blocks that are really just fine sanding pads. Another useful thing for this project is the eye shadow applicators. When I cut one of the sanding blocks into thirds, I get these cubes that are easier to handle. The red and black ones are coarse and the white ones are very fine. Start with the roughest side of the red and black block. This will be to shape the mend and get it trimmed down and the surface contour matching the rest of the piece. When the shape is right, then use the other side to sand off any bumps or ripples. Also sand the edge of the opening to match the contour.
Step 8
Sweep out on the edges to really blend the putty into the original plastic. This is very important so go slow and keep at it. When you're finished, the repair should look like a light spot on an otherwiase perfect piece - no more crack.
Step 9
Once the problem is reduced to just color, it's time to paint. The paint I use for this is Delta CeramCoat which is available in hundreds of colors at craft shops like JoAnne's and Michael's. It comes in 2 oz. bottles for about a dollar. Get a few of the flesh tones and a white so you can lighten the color if necessary. You won't be able to reslly judge your match until the paint is dry so put a dot on the doll. A good match will be invisible on the plastic when it's dry. You can wipe off the dried paint with rubbing alcohol if you need to try the match again. Once you have your color, put a small drop on the mend and use one of the eye shadow applicators to daub and tamp the paint out to the edges of the mend and then a bit beyond. When it's dry, (a few minutes) repeat putting on at least two more layers of paint.
Step 10
It's been 3 hours since the last coat and the paint is now thoroughly dry. If I'd used an airbrush, the surface would be perfectly smooth but since the paint was applied instead of sprayed, it has surface ridges.
Step 11
This is acrylic paint that has one very nice property, it can be sanded. So, using the white, super fine block, very lightly sand the surface of the paint to get rid of the ridges in the surface. Be careful not to sand so heavily that you scrub off the paint. You just want to smooth the surface of the paint.
Step 12
The surface should be pretty close to the rest of the surface but it can be better with a little auto wax or paste furniture polish. Put on a few drops and polish dry with a soft cloth. All done!
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