so it looks new again vs. so it'll look new again

[Zinaida]

English Grammar Tests, Elementary Level

ESL/EFL Test #295 "Real Life: Outdoor Chores (1)", question 5

My fence looks old and the original color has faded. I think I'm going to ......... it this weekend so it looks new again.

(a) color
(b) cover
(c) paint
(d) sweep

English Grammar Tests, Elementary Level

ESL/EFL Test #295 "Real Life: Outdoor Chores (1)", answer 5

My fence looks old and the original color has faded. I think I'm going to paint it this weekend so it looks new again.

Correct answer: (c) paint
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My question is: If I'm going to paint the fence how it looks already new? Why is the present used here? Thanks a lot in advance

[Beeesneees]

Sorry for the long wait. There are so many posts some days that it is easy to miss some.

It doesn't look new already. He expects it to look new after he has painted it.
I am going to paint, not I am painting.

The auxiliary tense "to be" (am) is used with the future simple verb tense "going to", so it's not the present tense.
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Cheers m' dears!

[Alan]