Thanks for your help.
But have managed to find 2 places in chanthabury district where we live.
One is a factory ,do rolls Pvc 15/20/25/40 micron etc. About 1500 a roll, depending size.
3.6 mtr wide - 40 Mtrs long, clear or black.
Another place is Thai wutvu diy shop/ builders.
2 mtr rolls black/ white. About 1300 bt a roll.
50-1.5 microns.
Also stock the glue for joining, about. 180 bt a tin.