Give one of these a try
think its likely to be US cloth
dacron 6 ounce (is this for sails )think 7 ounce would be better for around phuket suits 25-35 foot boat
http://www.rollytasker.com/
http://www.phuket.com/sailing/sails.htm
Company SeAir Sails
Address 57/5 Moo 2, Mai Khao
Amphur Thalang
Phuket 83140
Phone 348117
Fax 348119
Email
info@seair-sails.com
Internet
www.seair-sails.com
Tagline Quality.
International calls dial: +66-76-348117
Inside of Thailand: 076-348117