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What dilution ratio did you use?

I don't remember anyone trying 2 part. I've only used it once many years ago to make a mold. Can it be thinned or is there a very thin version made?

I'm not sure why you think "no" fabrics are waterproof. A high quality silnylon, good PU coated materials, cuban, etc., are for all intents and purposes, waterproof.

The DIY silnylon discussed in...

There is a big difference between "water repellent" and "water proof". The "scotchguard" type materials are water repellents and will not hold up under a heavy rain even with the pitch angles we use....

Spreading less then 2 oz of naphtha over ~2sf of mask, while still highly flammable, is considerably different than spreading it over a 10'x12' tarp with 240sf of surface area.:scared:

One best be...

Odorless mineral spirits has a lower flammability rating and a much higher flash point then Coleman fuel making it the safer solvent to use.