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
flagSwitzerland
2%
90%
4%
2%
50
flagthe Netherlands
4%
90%
0%
2%
42
flagPoland
5%
87%
3%
1%
18158
flagRepublic of Ireland
7%
84%
0%
5%
38
flagAustria
1%
80%
4%
10%
82
flagAustralia
4%
78%
6%
3%
146
flagGermany
4%
77%
7%
5%
508
flagthe United Kingdom
8%
75%
8%
2%
392
flagSingapore
12%
75%
9%
3%
32
flagCanada
9%
74%
9%
5%
86
flagUnknown
7%
74%
10%
5%
39
flagthe United States
8%
72%
9%
4%
1137
flagNigeria
5%
70%
13%
0%
37
flagIndia
11%
69%
8%
4%
765
flagMalaysia
2%
67%
7%
2%
40
flagGhana
4%
66%
4%
4%
24
flagPakistan
11%
64%
3%
7%
51
flagSouth Africa
2%
63%
14%
12%
41
flagthe Philippines
13%
61%
12%
0%
83
flagthe United Arab Emirates
4%
52%
28%
4%
25