How do I repair a broken polystyrene part?


I have a speaker whose mount broke. I previously tried to fix it using a common 2-part "5 minute" epoxy (I believe I did 2 or 3 separate applications, trying to get some thickness on it), but after a few months that repair failed (if I remember correctly, it was being picked up to clean underneath, as had been done many times before, and it simply gave way).

The base (light gray, right side of photo) is polystyrene and I'm almost certain this piece is as well.

It originally broke on a bit of an irregular slice, going through some of the reinforced ridges on the part: it is 3.2mm at the narrowest to to 6.5mm at the widest. The break is also right where it sits in the base, so there's not a ton of lateral area to work with.

What can I use to reliably glue this part back together...

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You can use wax and polish and sometimes glue and tape to repair a scratched or broken DVD. Deep scratches may not be repairable, and may require professional help. Discs broken into two or more pieces are generally not repairable.

Sometimes you can save a scratched DVD with a little effort.

credit: Photodisc/Photodisc/Getty Images

Apply wax or polish sparingly to the scratched area. Spray furniture wax like Pledge seems to work best.

Hold the disc firmly and use a polishing cloth (not a paper towel, napkin or tissue paper) to buff gently in a back-and-forth motion. Avoid using a circular motion or you may make the damage worse.

Let the disc dry completely before you try to play the disc.

Carefully apply modeling glue or super glue, using a pin or toothpick, to the damaged area. Apply only to the damaged area.

Allow the glue to dry completely. Time will vary depending on the glue.

Try to play the disc.

Apply a tiny...

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Hello, folks.

I'm in need of some advice.

I bought a 1/48th Hercules ("J" model) at the Cosford show on Sunday. It has an issue, which I'm at a real loss to solve.

In essence, the main cockpit transparency has been (cleanly) snapped in half. How do I repair this?

I have some Revell Contacta cement, which I believe is very good with transparent parts, but will this be strong enough to hold the two canopy parts together? I strikes me that the glue has only a very narrow area to get a purchase on. Will this make the join very weak?

I appreciate that Super Glue would not be the way to go on this one (due to the fumes it gives off as it cures).

Once I've glued it together, what can I use to disguise the break? Johnson's Klear? If I try and fill it with something clear drying, should I try sanding it back or will that make it more obvious?

Any advice will very much appreciated.


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You're not too combative - it's good to get some attitude some times and here's mine as well..... I know exactly what your experiencing and was caught in the middle of it for quite awhile here, what threw me off with the initial comment was the broken references with the x's - I don't get them, but I do get broken references once in a while, didn't happen for a few months till today.

The problem with this bug if that's what it is, it's never consistent, everything will work perfect till all of a sudden there are broken references again. I have been trying to figure out preventive measures and I would like to feel I got to the bottom of it, but.... till today.

We have a simple shelf unit that was turned into a custom unit and what I do is open the original file and do a pack & go to my desktop, to make sure all links are broken. I pack & go all the parts, drawings and assemblies in the folder, I use the search and replace to give the files a different name. Then I...

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No matter how careful you are with your teeth, you may need to repair your dentures. Everyday items that you find at a home store can help you repair your dentures when an untimely break occurs.


If you dropped or found your dentures unexpectedly split in half, you can make them whole again -- at least temporarily -- with epoxy. When prepared properly, epoxy can hold two porous surfaces of plastic together for emergencies and allow you to wear your dentures until you can get a professional to repair them. Epoxy requires a clean surface to adhere and a preparation area such as a paper plate to combine the two reactionary glues. Use a wooden stick to apply the epoxy.

Fine-grade Sandpaper

Whenever epoxy is applied to dentures -- or any fast adhesive glue such as superglue -- have either an emery board or other fine-grade sandpaper product on hand to smooth out the rough edges that can be left by the glue. Epoxy swells and cause irritation if the...

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February 13, 2018

A screw is broken, turns through, or is stuck in a workpiece? No problem, with our instructions you can easily get it out.

The following reasons may explain why a screw breaks, turns through, or is stuck in the workpiece:

The screw

is very old, rusted and therefore exhausted. has been broken off due to excessive tightening torque. is made of a soft material and was not suitable for the application.

Required tools

Since the screw can only be turned to the left, you need left-hand cutting tools.

The diameter of the left-hand cutting twist drill should be max. half the diameter of the broken screw. If the screw has a diameter of 12 mm, the twist drill should have max. 6 mm.

In any case, you should use rust removers such as penetrating oil (e.g. WD-40) before processing. Rust remover loosen stuck screws and corroded metal connections.

The working procedure

The probably easiest way to turn a...

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There are different reasons why people wear dentures. Some wear them for corrective measures, to make sure that the space between teeth do not widen. Some wear them to give them a full smile. For people who wear dentures, it is an extremely important and personal accessory that can affect confidence and esteem. Hence, when a denture is misplaced, it causes anxiety. When a denture is broken, it causes reason to be affected, since dentures are not easy to make and are costly. However, dentures can be easily fixed as long as the parts are saved.

For a chip in the denture:

There are different ways how a denture can be broken. A simple chip can happen just because of biting on a hard surface, bumping the denture accidentally, or dropping it while cleaning. If your denture is broken by just a chip, this is very easy to repair.

Just get super sticky glue like Crazy Glue. Do not use tacky glue or school grade glue, as this would not be able to hold the part together. ...
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Clean the area surrounding the break in the glass. If debris is present inside the break, use the solvent to clean the area. Once the clean mirror dries, apply the stabilizer tape to the length of the crack. This tape has a peel-off backing that must be removed before application. Use your fingers to press bubbles that appear under the tape to the edge.

Fill the syringe included in the kit with the repair resin. Insert the syringe through the stabilizer tape and press the plunger to dispense the resin into the crack. Continue pressing the plunger until the material fills the entire length of the crack. Leave the tape in place while the resin cures. Refer to the kit directions to determine the curing time it requires.

Remove the stabilizer tape and apply more resin along the top of the repair. Immediately place the cure film from the kit over the resin. Once the second layer dries, remove the film. Use a razor knife to remove excess resin from the glass and clean the...

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After 20 years & multiple removal/reinstallation cycles, any or all of the fastening features found on the backside of these trim plates are or will become broken or missing. If you are lucky, these fastening features, although broken, are still retrievable & salvageable. The trick for removal is to gently pull the plate's upper & forward portion out to disengage, then up to remove (refer to Service Manual 88-905B for diagram). Left Door Mirror Interior Trim Plate 124-720-11-11-xxxxRight Door Mirror Interior Trim Plate 124-720-12-11-xxxx
Admin edit: "xxxx" = color code from EPC chart, i.e. black = 9045

A quick fix can be accomplished using a couple strategically placed globs of 3m mastic. Work the mastic with your fingers to warm it up. Press in place. Done…or with some patience & precision, the original fastening tabs can be repaired or recreated so the trim plate will once again fit as designed.

Tools & Materials

Any 1990s era donor Mercedes door mirror interior...
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First of all, don't let your friend near a USB flash drive EVER again! :P Apart from that, soldering is about your only option.

If you have a Raspberry Pi or old computer that you wouldn't mind if you fried the port, you could try carefully plugging it in. Like already mentioned, a USB extension cable will give you the access to more carefully plug it into the computer. If you're that desperate to risk a perfectly good computer, go ahead and use your main one.

If you can see a break in the connection, don't do it. Worse things could happen than your math homework missing.

As for soldering, it seems like it is only the connector that is damaged. If the PCB is fine, you could do this:

Take an old USB cable and cut the B end off. Strip the newly exposed wires. Take a soldering iron and carefully solder the wires on. If you have an old sock/etc. I might say put that over the main chip in case the iron slips so the chip isn't damaged. It isn't foolproof, but it...
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If you just want a glue that works for "Styrofoam" (polystyrene foam), several things will work:

....low-temperature "hot glue" guns work fine for polystyrene foam, but high-temperature hot glue guns reach 385° F and will melt it (though the unhealthy "burning" doesn't occur till 490°)...low temp guns reach only 250° F
.......if you only have a high temp gun though, let the glue cool for a second or so before contacting the foam
(It's the gun that makes the difference... most glue sticks nowadays are hi-low temperature so they'll reach the temperature created by the particular gun)

..."white glues" (permanent type, like Elmers Glue All, or a "tacky" white glue would be even better)

...a 2-part epoxy glue is recommended if the foam will be exposed to much moisture or heat later

...Super 77 spray adhesive

Were you also looking for something to put in the holes that would be smooth and fit exactly? If so, something like spackle or "structural...

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Fixing Cracked and Broken Plastic Parts

I have lots of cracked and brittle plastic inside I'd like to start going through. The glove box is very flimsy and all of the mounting holes are cracked. All of the heater vents are falling apart.

You can actually fix the plastic. Some have used epoxy and other glues, but the correct way to do it so it never happens again is to get some fiberglass cloth (the woven stuff, not the random mat), some CA glue (crazy glue), some CA accelerator and some gorilla glue (aka urethane glue).

On the back of each crack lay a piece of the fiberglass cloth and put the CA glue around the edges. The stuff will soak right through and make the fiberglass sort of transparent. Spray some acclerant on. Once you do this the fiberglass is on there for good.

If the crack is in a non-stress area, use more of the CA glue in the center and let it dry. The resulting bond and repair is much stronger than the original plastic and will never...

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And here it is, finished and ready to ride. It ended up just over 16 lbs, which is lighter than my 9-4 Surftech that isn't as wide or as thick. I didn't weigh it when I first got it, but it was pretty wet then anyway. It is a little over 1/2 lb heavier than when I first fixed it, but now it has 3 layers of 6 oz cloth - one layer below the pour foam and two layers above. I used regular Krylon fast drying spray paint. The Krylon Fusion is nice stuff too, but it takes 7 days to harden enough for use. The regular Krylon requires a primer undercoat, but hardens enough for sanding and polishing over night, and can be surfed as early as 48 hours after painting. One of my boards was painted with Krylon over two years ago and still looks fine. After several weeks of use, I'll update this page with how the board performs and is holding up. I don't advise launching into a major pour-foam repair effort until we see how the...

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