I am curious which mic and rig you have. I would suggest a product called hi marks. it is designed specifically for marking appliances safely. it  is also removable without residue if you later sell the mic and rig. sticky things tend to come off and leave residue that gums up the buttons very easily., and hi marks doesn't come off easily when touched. it is also much easier to feel hi marks because it is similar to glue and dries quickly. you can put what is about the size of a braille dot on the buttons if you wish.
73 and good luck
kb7nla
On Apr 14, 2013, at 6:29 AM, Fred Adams <[log in to unmask]> wrote:

> I use these little rubber bumpers on computer keyboard, all of my ham radio
> equipment, microwave oven and I put them on top of my ham radio to keep the
> LDG and RFA P2000 from sliding backward etc.  I seldom ever have one to
> fall off.  I think you can get them from most places that sell to the
> blind.  They come in different sizes and shapes.
> 
> -----Original Message-----
> From: For blind ham radio operators [mailto:[log in to unmask]]
> On Behalf Of Pat Byrne
> Sent: Saturday, April 13, 2013 5:04 PM
> To: [log in to unmask]
> Subject: Re: Marking a Mic for easier use
> 
> Perhaps the little stick on dots that they have in home stores as picture
> frame bumpers etc.  They have peel off backing with sticky on them.  Work
> pretty well for identifying things.
> Pat, K9JAU At 02:58 PM 4/13/2013, you wrote:
>> I have a Kenwood mic that the buttons are very hard to use.  They 
>> aren't raised they are kind of flush.  Does anyone know of something 
>> that will adhere to a couple of the keys.  That I can put on it?  So I 
>> can move around the mic faster?  Thanks for your help.
>> 
>> 
>> 
>> 
>> 
>> -Blake KA5POW
>> 
>>