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Old 03-04-2022, 07:53 PM
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dlazarus6660 dlazarus6660 is offline
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Default Estes plastic parts RTF

Estes RTF plastic parts.
A while ago, in search of a model R/C aircraft,
I came across some model rocket parts.
It was fin can and N/C.
I made a rocket from it.
The fin can broke a fin and I tried to glue it back on.
The glue did not take.
The fin can will not take plastic glue.
So... What do I
use?



Thanks in advance.
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Old 03-04-2022, 09:37 PM
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Default

Some plastics are just not "repairable", unfortunately.
Do you know what kind of plastic it is ?
If you did, I would be able to suggest a bonding agent.
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Old 03-11-2022, 08:23 AM
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blackshire blackshire is offline
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Quote:
Originally Posted by ghrocketman
Some plastics are just not "repairable", unfortunately.
Do you know what kind of plastic it is ?
If you did, I would be able to suggest a bonding agent.
*Nods* In his Handbook of Model Rocketry, G. Harry Stine listed several materials--including different plastics--and the best bonding agents to use on them (for cementing the material to itself, or to other materials). Not knowing which plastic is "in play" here, there are some broad, "part material-independent," recommendations that can be made:

Contact cement will glue anything to itself, or to anything else--but it grabs *instantly*, making proper alignment of the "to be joined" parts vitally important. Ditto for cyanoacrylate (i.e., "Super Glue"), which also bonds as soon as the parts are pressed together. Epoxies--especially the ones with longer curing times (longer "pot lives"--they are also much stronger than the five-minute stuff, when cured)--also ought to work; so should polyurethane glues, which are sometimes, but not always, two-part bonding agents, like epoxy. (The two-part polyurethane casting resins [or epoxy casting resins, too], such as Alumilite, Por-A-Kast, Polytek, etc., are also effective bonding agents, as I've found [their documentation also mentions this use].) But:

As Stine also mentioned in his book, there are some plastics--such as PVC, and other, "waxy surface-like" ones--that are "resistant," so to speak, to commonly available bonding agents; but even for these plastics, there are--as he also wrote--specialty bonding agents available. LOCTITE (see: https://www.loctite.com/loctite-location-selector.html ) offers multiple formulas of Industrial and Consumer (there's a separate webpage on their site for each category) epoxies--most, but not all, in their famous dual-syringe dispensers--that are formulated to bond many different types of plastics to themselves, and to other materials.
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Last edited by blackshire : 03-11-2022 at 08:44 AM.
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