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Generic 'anti slip tape' from ebay, like this:
http://www.ebay.co.uk/itm/Anti-Slip-Tape-High-Grip-Adhesive-Backed-Non-Slip-Tape-/390433796352?var=&hash=item5ae7aaf100:m:mZ2UcWCb7AxFt3Unldyw4bQ
If you're tarty, make a template using masking tape or cardboard first, then use to cut the grip tape to shape.
Adhesive on skateboard tape is designed to be removed easily from a semi-porous surface, so won't adhere or resist sweat as effectively as the stuff designed for floors and stairs.
Thoughts on this stuff for the base bars?
http://www.ribblecycles.co.uk/velox-tressorex-cloth-handlebar-tape
If not, where's a good place to buy that grip tape that's been mentioned?