Table 1. Differences in color parameters of the gel-coat depending on chemical structure of the diisocyanate before and after QUV-exposure tests.

Sample code	ΔL*	Δa*	Δb*	ΔE*
IPDI	-0.04	-0.07	0.28	0.29
HDI	-1.89	-0.03	1.27	2.28
HMDI	-0.04	-0.11	0.41	0.43
XDI	-0.58	-0.13	0.86	1.05