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.
Kasia
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Very interesting!
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
flagthe Netherlands
3%
96%
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27
flagRepublic of Ireland
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6%
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flagSwitzerland
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flagFrance
5%
88%
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flagPoland
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3%
1%
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flagSingapore
8%
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12%
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25
flagGermany
6%
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6%
3%
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flagthe United Kingdom
7%
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7%
2%
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flagAustralia
6%
77%
7%
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flagCanada
9%
76%
7%
4%
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flagAustria
0%
76%
5%
17%
17
flagUnknown
7%
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10%
5%
39
flagthe United States
8%
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9%
4%
940
flagIndia
9%
70%
8%
3%
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flagSouth Africa
3%
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13%
6%
30
flagMalaysia
0%
65%
10%
3%
29
flagNigeria
0%
62%
25%
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16
flagthe Philippines
13%
61%
10%
0%
65
flagPakistan
9%
60%
4%
9%
41
flagthe United Arab Emirates
6%
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25%
6%
16