I have never sharpened my router bits (they are all the nice ones with the carbide cutters). However, pitch will develop on them after some use. I just use a bit cleaning solution I got from woodcraft (i am sure you can use cheaper alternatives with the same result) and a brass brush to clean the pitch off. Make sure you use a brass brush and not a steel brush as the brass wont damage the cutters.

Hope this helps.

-Reece

I have never sharpened my router bits (they are all the nice ones with the carbide cutters). However, pitch will develop on them after some use. I just use a bit cleaning solution I got from Woodcraft (I am sure you can use cheaper alternatives with the same result) and a brass brush to clean the pitch off. Make sure you use a brass brush and not a steel brush as the brass won't damage the cutters.