# Applying Loctite 648 on motor shaft ? Sanding ? Primer?
**URL:** https://foil.zone/t/applying-loctite-648-on-motor-shaft-sanding-primer/3446
**Category:** Propulsion System (Motor, Gears)
**Created:** [December 7, 2018, 12:56pm UTC](https://foil.zone/t/applying-loctite-648-on-motor-shaft-sanding-primer/3446 "2018-12-07T12:56:07Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@philgib](https://foil.zone/u/philgib)
#### Post date: [December 7, 2018, 12:56pm UTC](https://foil.zone/t/applying-loctite-648-on-motor-shaft-sanding-primer/3446/1 "2018-12-07T12:56:07Z")
Hello guys.
Any best way to apply the Loctite 648 for glueing the pinion on the motor shaft ? Do you have to slightly sand the shaft ? Need a primer ? Alcohol ?
I just ordered it, but now I am reading that Loctite 680 is a better fit for this specific use … Dôh… Super expensive though !
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> Loctite® 680 Retaining Compound - Gives best resistance to dynamic, axial and radial loads. Recommended for retaining shafts, gears, pulleys, and similar cylindrical parts
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### Author:  [@Alexandre](https://foil.zone/u/Alexandre)
#### Post date: [December 7, 2018, 1:11pm UTC](https://foil.zone/t/applying-loctite-648-on-motor-shaft-sanding-primer/3446/2 "2018-12-07T13:11:07Z")
The way i did it
- little sanding on the shaft , acetone clean and dry
- pinion : acetone clean and dry
- measure the distance between the bottom of pinion and the bottom of the flange screwed to the gearbox , in order that the top of the pignon is flush to the gear of the gearbox
- put glue on the Shaft and in the pinion
- twist the pignon on the shaft at once no stop allowed, all the way , stopping at 2-5mm from the motor depending of the thickness of the fange
I used the one sold with the gearbox
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### Author:  [@philgib](https://foil.zone/u/philgib)
#### Post date: [December 7, 2018, 3:55pm UTC](https://foil.zone/t/applying-loctite-648-on-motor-shaft-sanding-primer/3446/3 "2018-12-07T15:55:03Z")
Merci Alex, great tips !