Mr Kleane 03 Crystal Coat
R28C+Q6 San Sai Noi, San Sai District, Chiang Mai
On the middle ring road between the 1001 and 118.
I have had 2 cars and a pick up ceramic coated here. Although the name has changed over the years, I last used them a year ago. They do a great job even detailing the engine and interior. The initial cost isn't cheap, about 20,000 baht depending on vehicle size. No idea how this compares to the Honda dealers price.
They let you bring the car back about every 6 months (check w/them) and will do a "refresh" and detail if you like for 500baht. No problem with it lasting for years.
I only wash the car myself using a automotive shampoo and mitten first. I rinse the car completely and then use a leaf blower to dry as the water just bubbles up and blows away. Avoids scratches and swirl marks on a blk car.