to which 是什么从句，麻烦翻译下~

Question

In adiition to hacing a pleasing color,a paint must protect the surface to which it is applied and be easy to apply in a thin,uniform coat.

其中我想知道it指代什么，而to which在其中是引导什么从句的~~
谢谢各位高手指点呀
In adiition to having.
taping wrong。。。

Answer 1

it is applied and be easy to apply in a thin,uniform coat.
--it 指形式主语，指代to apply ......

which引导是定语从句，它在从句里指代前面的surface,至于用to ,for ,in ....我先还原这个从句再说吧

it is applied and be easy to apply in a thin,uniform coat to the surface

--

Answer 2

定语从句
to which是把介词提前了
本来to是给Applied的
词组Apply to

介词提前的情况很多的
LZ得好好积累了

Answer 3

it 指前面的 a pleasing color

Answer 4

应该是which it is applied to
只不过是把to提前了而已