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Filler that could easily take a screw?


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  • RMweb Gold

I am modifying a model using a resin body on an RTR chassis. However, because I have had to remove the body a couple of times, I find that the resin material has not provided a resilient purchase for the screw. I've tried sticking a piece of plastic over the screw hole. That gripped the screw well but used superglue to stick it down and that has come away from the resin. I could redo that but I wonder if it would be better to fill the original screw hole in the resin and use a self tapping screw. 

 

Could anyone please suggest the most suitable filler to use? Thank you.

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If you use Milliput it can be drilled and  tapped, carefully, and your screw replaced by a machine screw.

Self tapping screws rely on distorting whatever you are tapping into, do the forces will just destroy any resin filler

Edited by JeffP
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Epoxy would work but you'd probably need to drill a pilot hole into it otherwise it could split.

 

If the item is big enough you could retap the resin, insert a helicoil and screw into that.

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  • RMweb Gold
5 minutes ago, JeffP said:

If you use Milliput it can be drilled and  tapped, carefully, and your screw replaced by a machine screw.

Self tapping screws rely on distorting whatever you are tapping into, do the forces will just destroy any resin filler

 

Thanks. I accept your point about self tappers. Will have to search the screw box and get some taps - always something missing from the toolbox! :)

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  • RMweb Gold
8 minutes ago, HR_Line said:

Epoxy would work but you'd probably need to drill a pilot hole into it otherwise it could split.

 

If the item is big enough you could retap the resin, insert a helicoil and screw into that.

Thanks. Something to think about.

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  • RMweb Gold
4 minutes ago, Hibelroad said:

Could you fill the hole with epoxy and push the self tapper in before it sets ? That way the glue would set around the screw and hold it in place. 

Thanks but I think I would be worried about taking the screw out again and doing more damage though. The loco is DCC and I have had a bit of bother with the chip and had to remove the body a couple of times already.

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  • RMweb Gold

I think I'd try and expoxy a suitable nut on the inside. Then just use a machine screw into that.

Trick is to keep the epoxy out of the threads, but any that does leak in can be cleaned out with a tap. The screwing kind, not the water kind!

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1 hour ago, russ p said:

Plastic steel which comes as a sausage like thing , you chop a piece of and roll it to active it .

Its very strong 

Thanks for info. Could I tap into it?

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  • RMweb Gold
1 hour ago, ikcdab said:

I think I'd try and expoxy a suitable nut on the inside. Then just use a machine screw into that.

Trick is to keep the epoxy out of the threads, but any that does leak in can be cleaned out with a tap. The screwing kind, not the water kind!

Thanks. That sounds feasible. Need to buy some suitable screws and nuts but that should be OK.

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1 hour ago, highpeakman said:

Thanks for info. Could I tap into it?

 

Absolutely its quite a fine texture.  Most car shops sell it and possibly boyes 

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