Originally Posted by caunyd
Hi guys, I have an all black Trek bike. I just want to paint red highlights/trim on it. Since I am just painting on highlights, rather than repainting the entire bike, do I have to sand down the black areas and add primer where I want it repainted red? Or can I just paint over the existing black paint?
What's the downside of just painting over the old paint?
First, wash and rinse your bike. Nobody should have to say this, but apparently its required to say, for a few folks.
Slim's Paint Method:
(1) Place tape over the margins of the areas you want to paint. This will leave the area you want to paint, exposed.
(2) Now, lightly sand (300 grit) the exposed area, being very careful NOT to rip or disturb the tape.
(3) Now, steel wool the exposed area with 00 steel wool.
(4) Wipe down with 100% denatured alcohol and wait a half hour for it to dry.
(5) Use autobody grade paint primer and with a fine haired paint brush, paint primer on the exposed area.
(6) Wait 24 hours.
(7) Lightly steel wool the exposed and primed area again with 00 steel wool.
(8) Wipe with alcohol again and wait for it to dry. Meanwhile, clean your paint brush with paint thinner.
(9) Now, paint your exposed area that's been primed, with the intended autobody paint color.
(10) Wait 24 hours. Steel wool it with 00 steel wool again and wipe it down with alcohol once more.
(11) Paint it one more time after the alcohol is dry. If you are using hi-glosspaint, you're done!
(12) If you're using flat paint, then wait 24 hours and clearcoat it, after you wipe it down with alcohol and the alcohol has dried.
* Wait at least three days before riding your bike (preferably five days).
Wear gloves whenever handling your bike to avoid skin oil contamination.