Marcfell,
Don't be put off by the comments above. Petrol and Methanol are in the same category. Flammable Liquids. Check with your insurance company how much petrol you can store in your garage. Most will allow 20 or 40 litres for the mower, motorbikes, car, lawn edger and chainsaw.
You may need to build a separate storage shed, to store 200L, with appropriate space between that and the house, fence and garage. This may not be possible with your home, but only you can determine that.
With any flammable liquid to ignite, there needs to be 2 other things present. The flammable liquis is the fuel, you also need oxygen (air) and a source of ignition. Excluding any one of these will prevent ignition and fire.
A source of ignition rarely considered is spontaneous combustion where rags which vegetable oil on them can ignite due to the heat generated as the oil oxidises.

Another method of storage may be to decant the methanol into 20 litre drums and store them separate from the house, locked in a shed for this purpose only. Only one 20 litre drum would be in the garage at a time and then only during the processing. This should remove the risk from your garage and house. By being a single purpose shed, it would not have any source of ignition present.

I hope this has helped you and provided you some options.

Regards,
Tony

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