I wouldn't go 50/50 because you want the mix to evaporate as quickly as possible. I would go with a couple of table spoons in a glass of tap water. As long as it feels slippery on the decal and not just wet it will work. Another good trick is to use painter's tape to set up your straight edge so that you can get the decal on plumb. Then just pull the tape off after the decal sets up or whenever you are satisfied.
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1811 Hydro
"Failing to prepare is preparing to fail".
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