TABLE 6.

Mean and standard deviation values of the gloss retention of both neat and ZP-modified epoxy coatings.

Aging months	Neat epoxy		ZP modified epoxy
Before aging	Gloss GU 198.01	GR% 100	Gloss GU 198.01	GR%
November	181.26 ± 1.36	91.54	187.14 ± 1.41	94.51
December	169.32 ± 2.58	85.51	176.62 ± 2.48	89.20
January	147.71 ± 3.41	74.60	159.37 ± 3.51	80.48
Feb	186.21 ± 1.11	94.10	190.74 ± 1.36	96.33
March	171.87 ± 2.32	86.90	182.36 ± 2.47	92.10
April	151.32 ± 3.25	75.52	168.85 ± 3.65	85.27
May	173.58 ± 1.21	87.74	182.21 ± 1.01	91.91
June	152.25 ± 2.21	76.91	169.45 ± 2.36	85.58
July	101.52 ± 3.34	51.34	136.74 ± 3.75	69.10
August	189.35 ± 1.31	95.55	193.98 ± 1.29	97.96
September	166.67 ± 2.47	84.17	174.35 ± 2.51	88.02
October	141.12 ± 3.61	71.27	156.52 ± 3.49	79.05