Why are gliders almost always painted white?
to easily hide in clouds
to reduce solar heating
to make gliders distinguishable from other aircraft
to allow quick replacement of damaged parts
Since fiberglass resin softens at high temperatures, white is used almost universally to reduce the temperature rise caused by solar heating. Less popular non-fiberglass gliders (those made of aluminum and wood) can be painted any color.
reach: rather globalaviationcolorsglidersphysicstechnologywhite
Answers by country
to easily hide in clouds
to reduce solar heating
to make gliders distinguishable from other aircraft
to allow quick replacement of damaged parts
answers
 the Netherlands
the Netherlands52
 Poland
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 Switzerland
Switzerland106
 Republic of Ireland
Republic of Ireland51
 Austria
Austria137
 Australia
Australia160
 Germany
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 the United Kingdom
the United Kingdom458
 Canada
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Singapore39
 Unknown
Unknown39
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Malaysia43
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Pakistan56
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Ghana30
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the Philippines95
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South Africa47
 the United Arab Emirates
the United Arab Emirates30