Sanding and glassing 3D printed PLA duct

Just about to start sanding and glassing my 3D printed PLA duct. Any advice on the technique, number of coats etc,

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Hello perso I sanded with 120 and 600 with water before putting a plastic primer ( 2 thin coats). Then three coats of MOTIP black paint (spray paint) and to finish 2 coats of SPRAY MAX 2K matt varnish.

Thanks @Manu do you think your method is as strong as using epoxy resin?

This is the method I used for my Electric mountain board and it is shock and scratch resistant…

https://www.e-sk8.fr/t/foraker-trampa-holypro-35-12s12ah-overion-6374-escape-6-4-metr-pro/3014

Cool thanks, I might give it a try it sounds a lot easier and less messy than using epoxy

Thanks for the pics, what brand of plastic primer spray did you use?

MOTIP PRIMER PLASTIC
https://www.pecamax.fr/primer-special-pare-choc-et-plastique-400-ml.html
I bought it at FEU VERT car store