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Experimental variables.
| No. | Specimen Name | Surface Hardener |
Surface Roughness Agent | Metal Spray | Sealing Agent |
|---|---|---|---|---|---|
| 1 | Control | X | X | O | X |
| 2 | SH | O | X | O | X |
| 3 | SRA | X | O | O | X |
| 4 | SH–SRA | O | O | O | X |
| 5 | SH–SRA–SA | O | O | O | O |
SH: Surface Hardener, SRA: Surface Roughness Agent, SA: Sealing Agent.
