## 3 Results
### Adhesion  
The characterisation of adhesion by lattice cutting of the original coatings of the COA1 substrate indicates that it is a category 0 laminate (Table 6): the incisions caused by the equipment do not show flaking and are perfectly smooth. The effect of the cold (\(-75\)\({}^{\circ}\)C, 0.5 cm distance, 8 min) has produced a slight alteration in the adhesion, corresponding to category 1. Therefore, we perceive that it is a 1-2% effect (see Figure 11), as we observe in the interstices of the cut a slight flaking that causes a jagged effect. This could also indicate defects in the lattice-cut test method.  
\begin{table}
\begin{tabular}{c c c c c c} \hline \hline \multirow{2}{*}{**Code**} & \multirow{2}{*}{**Cutting Tool**} & \multirow{2}{*}{\begin{tabular}{c} **Classification** \\ * **(Before)** \\ \end{tabular} } & \multirow{2}{*}{\begin{tabular}{c} **\%** \\ **(After)** \\ \end{tabular} } & \multirow{2}{*}{\
\begin{tabular}{c} **Classification** \\ **(After)** \\ \end{tabular} } & \multirow{2}{*}{
\begin{tabular}{c} **\%** \\ **\%** \\ \end{tabular} } \\  & & & & & \\ \hline COA1 & 2a & 0 & 0\% & 1 & \textless{}5\% \\ MTN\_94\_N & 2a & 1 & \textless{}5\% & 1 & \textless{}5\% \\ MTN\_WB\_N & 2a & 1 & \textless{}5\% & 1 & \textless{}5\% \\ MTN\_N2G\_N & 2a & 2 & 5–15\% & 3 & 15–35\% \\ MT\_T & 2a & 1 & \textless{}5\% & 1 & \textless{}5\% \\ MTN\_94\_V & 2a & 2 & 5–15\% & 2 & 5–15\% \\ MTN\_WB\_V & 2a & 1 & \textless{}5\% & 1 & \textless{}5\% \\ MTN\_94\_M & 2a & 1 & \textless{}5\% & 2 & 5–15\% \\ MTN\_WB\_M & 2a & 1 & \textless{}5\% & 1 & \textless{}5\% \\ MTN\_94\_R & 2a & 0 & 0\% & 0 & 0\% \\ MTN\_WB\_R & 2a & 0 & 0\% & 0 & 0\% \\ MTN\_94\_A & 2a & 1 & \textless{}5\% & 1 & \textless{}5\% \\ MTN\_WB\_A & 2a & 1 & \textless{}5\% & 1 & \textless{}5\% \\ MTN\_HP & 2a & 0 & 0\% & 0 & 0\% \\ M\_T & 2a & 1 & \textless{}5\% & 5 & \textgreater{}65–100\% \\ \hline \hline \end{tabular}  
* Classification according to ISO 2409:2020 [63].  
\end{table}
Table 6: Adhesion test results by lattice cutting. Adhesion values before and after treatment. Source: own elaboration, 2023.  
Figure 10: Experimental test of the effect of cold on intercoat adhesion. Zone 23_M_T: (**a,b**). Source: own authorship, 2023.  
With regard to the changes in the adhesion of the aerosol-coated laminate to the substrate, the classification of the MTN_NN2G_N polymer without ultra-cold treatment corresponds to Classification 2. The affected area of the aerosol grid is 5-15%. After 8\({}^{\prime}\) of cryogenic blasting, there was an increase in the affected area, corresponding to a release rate of 15-35% (Classification 3), with no alteration in the characteristics of the substrate coating. The aerosol flaking extends along the edges in large bands, accompanied by losses affecting the area of the squares (see Figure 12). On the other hand, the MTN_94_M material responded with a noticeable loss of adhesion after application of a constant cryogenic temperature. The initial Classification (1) was altered with the effect of the cold, causing flaking in the incisions equal to 5%, corresponding to Category 2 (see Figure 13). The adhesion test carried out on the M_T aerosol after the application of ultra-cold air also shows a decrease in adhesion, increasing the percentage of loss to close to 5%. This results in the adhesion classification of the coating, whose category is between Type 1 and 2 (see Figure 14). However, by increasing the exposure time above 8\({}^{\prime}\) (++), 100% loss was achieved (Classification 5).