After treatment with Ultramar Sail & Spinnaker Coating, your sail will feel lighter sooner, because it will hold virtually no water, sand, etc.
No, you will not notice the difference. Your sail will feel lighter sooner, because it will hold virtually no water, sand, etc.
Tests on paragliders have shown virtually no difference in weight. Because the fabric is more airtight after treatment with Ultramar Sail & Spinnaker Coating, the sail feels lighter because it builds up more pressure.