Where to buy marine paints & gel coat in Thailand

I only seem to be abe to find very expensive suppliers in Phuket for gel coats and marine paints for a boat refurbishment.

I live in Bangkok but the boat is under refurbishment in Prachuap Khiri Khan so would be grateful for any info re other suppliers that are hopefully less outrageous with their prices

I would aso be grateful for any info re a good spray painter or repair yard for the prep and paint job

Any info is appreciated