Painting a stem

[Imlach]

Hi

I have a Specialized stem that I'd like to keep on my Rockhopper but I am not so happy with the aluminium colour. I'd prefer a black stem so I was wondering if anyone has had any luck scuffing up the surface of an aluminium stem and painting it with a product like spray.bike? Would this end up looking like a horrible DIY project or is it possible to get decent results?

 

[enc]

Re:

Yes, it can be done but unless you already have the paint and materials it might prove more cost-effective to buy a new stem in the desired finish.

 

[Kona-Ian]

Just key it up, buy some etch primer and some generic gloss black.
Any pics of the stem?
Like any awkward bits to get at?
Awkward bits you can use a dremel stone in a drill.
Wire wool will help to start with.

 

[jimwise68]

I've done it on a few riders and it's been ok.

As Kona-Ian said, rub down, etch primer, gloss black and then clear coat it.

Just take your time and let each coat dry first. Ideally leave the painted stem outside in the sun for a few days to harden (bring it in after dark ). Bodyshops use UV lights to harden paints and this is a good enough alternative.

If you can mask the threads off first.

 

[lensmansteve]

I've had good results spraying straight on to keyed-up alloy with Wilco BBQ and woodstove paint. Have done several stems, cranks, seatposts etc. Very durable finish, keys on really well. Only available in matt black though. I haven't tried a gloss coat over the top, but it might well be ok.

 

[Kona-Ian]

Yo Jim, gloss black should be fine without lacquer.

 

[Imlach]

Thank you for all the tips. I'll see if I give it a go, else I might just end up buying a new stem. I'd have to mask up the steerer tube clamp and handlebar clamp to prevent any changes in the diameter right?

 

[lensmansteve]

Yup.. Don't leave the masking tape on the stem for any longer than is needed, it dries out over time and can be difficult to remove cleanly.

 

[itscervo]

When using/buying etch primer always check the use by date marked on the bottom of the can.