This product is Methanol based, but cut with enough water to be safe to use indoors. To obtain a freeze protection of 15 degrees you need 30% by volume

If the website says we are out of this product it is because of many sales orders we have logged. This has always been available to sell.

20% by volume required for 15 degree freeze protection

25% by volume needed for 15 degree freeze protection
Available Stock: 3

30% by volume for 15 deg. freeze protection
Available Stock: 2