I thought it was lacquer thinner.
( I ( ( thought ( it ( ( was lacquer ) thinner ) ) ) . ) )
(ROOT (S (NP (PRP I)) (VP (VBD thought) (SBAR (S (NP (PRP it)) (VP (VBD was) (ADVP (RB lacquer)) (ADJP (JJR thinner)))))) (. .)))
It's not thinner, so maybe I need to find something else. 
( ( ( ( ( It ( ( 's not ) thinner ) ) , ) so ) ( maybe ( I ( need ( to ( find ( something else ) ) ) ) ) ) ) . )
(ROOT (S (S (NP (PRP It)) (VP (VBZ 's) (RB not) (ADJP (JJR thinner)))) (, ,) (IN so) (S (ADVP (RB maybe)) (NP (PRP I)) (VP (VBP need) (S (VP (TO to) (VP (VB find) (S (NP (NN something)) (ADJP (RB else)))))))) (. .)))