## 3 Results
### Colour Coordinates  
The results obtained were further statistically analysed. Figures 2 and 3 show Pareto effect size plots in standard deviation for coordinates L* and b*. The most influential factors (larger than 2) were the number of applicators used and the amount of topcoat applied, followed by the amount of the basecoat applied. The sandpaper used was the factor in the intermediate importance group. Figure 2 also shows the main effect plot for the factors studied. Increasing the number of varnish applicators resulted in higher coordinates of L* and b*. An increase in brightness was noted during the increase in application when the topcoat and basecoat were applied. The finer the abrasive grit size (220-220 and 400-400), the higher the coating performance. The type of board was first in the group of factors with the least impact on L* and b*. Board A, with higher density, achieved higher brightness. For UV mercury and LED lamp power, the line is horizontal (parallel to the \(x\)-axis), so there was no main effect. Each level of the factor affected the response similarly, and the response mean was the same across all the factor levels. \begin{table}
\begin{tabular}{c c c c c c c} \hline \hline
**One-Way** & & **DF** & **Adj SS** & **Adj MS** & & \\
**ANOVA** & **Source** & **The Total** & **Adjusted** & **Adjusted** & **F-Value** & \(p\)**-Value** \\
**Response** & & **Degrees of** & **Sums of** & **Mean** & **Mean** & \\  & & **Freedom** & **Squares** & **Squares** & & \\ \hline  & UV LED lamp power W/cm & 2 & 0.55 & 0.2756 & 0.01 & 0.991 \\  & UV mercury lamp power W/cm & 2 & 216.7 & 108.36 & 3.90 & 0.022 \\  & Amount of topocat & 2 & 3426 & 1712.96 & 152.20 & 0.000 \\ G. & Amount of basecoat & 2 & 75.06 & 3753 & 1.32 & 0.271 \\  & Number of applicators & 1 & 504.0 & 504.04 & 19.25 & 0.000 \\  & Type of board & 1 & 9.69 & 9.689 & 0.34 & 0.562 \\  & Sandpaper & 1 & 646.6 & 646.63 & 25.41 & 0.000 \\ \hline  & UV LED lamp power W/cm & 2 & 0.0292 & 0.01459 & 0.05 & 0.947 \\  & UV mercury lamp power W/cm & 2 & 0.0677 & 0.03385 & 0.13 & 0.881 \\  & Amount of topocat & 2 & 13.57 & 6.7839 & 34.50 & 0.000 \\ L\({}^{*}\) & Amount of basecoat & 2 & 7.974 & 3.9872 & 17.68 & 0.000 \\  & Number of applicators & 1 & 7.053 & 7.0528 & 30.79 & 0.000 \\  & Type of board & 1 & 0.3694 & 0.3694 & 1.40 & 0.238 \\  & Sandpaper & 1 & 0.6204 & 0.6204 & 2.37 & 0.125 \\ \hline  & UV LED lamp power W/cm & 2 & 0.0299 & 0.01497 & 0.04 & 0.963 \\  & UV mercury lamp power W/cm & 2 & 0.2822 & 0.1411 & 0.36 & 0.701 \\  & Amount of topocat & 2 & 24.40 & 12.2012 & 44.88 & 0.000 \\ b\({}^{*}\) & Amount of basecoat & 2 & 6.835 & 3.4175 & 9.43 & 0.000 \\  & Number of applicators & 1 & 12.09 & 12.0884 & 36.23 & 0.000 \\  & Type of board & 1 & 0.4319 & 0.4319 & 1.10 & 0.296 \\  & Sandpaper & 1 & 1.759 & 1.7587 & 4.55 & 0.034 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: One-way ANOVA analysis of gloss as a function of the process variables. Figure 2: Main effects and Pareto effects plots for coordinate L\({}^{*}\). A Pareto analysis was carried out for L* and b* data to account for statistically significant interactions between factors. The results pointed out the following relations: the amount of basecoat-topcoat, basecoat-topcoat-UV mercury lamp power and basecoat-UV mercury lamp power. An interaction plot was then generated to visualize the interactions taking place (Figures 4 and 5). In the case of topcoat-basecoat interaction, the coordinates L* and b* increased when the amount of topcoat and basecoat increased. The largest spread occurred when the smallest assumed amounts of topcoat (3 g/m\({}^{2}\)) and basecoat (40 g/m\({}^{2}\)) were applied. Moreover, analysing the mercury lamps' power, it is possible to state that increasing the power resulted in a slight increase in L* and b*. The last significant interaction concerns the basecoat and mercury lamp power.