The Karadon material is an amazing product, and can be refurbished many times. Click on the link below for their installation and finishing guide, and you will find finishing details on page 23, but in the meantime, here's what they say

Matte Finish:
Cleaning: To clean Karadon surfaces, soap and water will remove most stains. For the removal of more
stubborn stains the use of a burgundy Scotch Brite pad and a mild abrasive cleaner should remedy the
problem.
Scratches: To remove scratches, random sanding using a swirling motion with 240 grit or equivalent
sandpaper, followed by cleaning with a burgundy Scotch Brite pad and a mild abrasive cleaner should
remedy the problem.

Satin Finish:
Cleaning: To clean Karadon surfaces, soap and water will remove most stains. For the removal of more
stubborn stains the use of a less abrasive white Scotch Brite pad and a mild abrasive cleaner should
remedy the problem.

High Gloss Finish:
Cleaning: To clean Karadon surfaces, soap and water will remove most stains. More stubborn stains
should be removed by using a polishing compound, such as 3M Perfect-It III with a soft cloth.
Scratches: To remove scratches from a high gloss finish, progressive random sanding starting from 400
grit (or equivalent) sandpaper, up to 1000 grit. The surface should then be machine polished to achieve its
high gloss finish. It is recommended to contact a certified Karadon fabricator to restore Karadon surfacing
to High Gloss, should the customer not own or have access to the necessary tools.

http://www.karadon.com/PDF/Fabrication_Manual.pdf