Purpose: To evaluate the effect of there different P/L ratios on the tensile and shear bond strengths of Manually Mixed GIC. Materials and method: A total of 28 upper maxillary molar resin dies were constructed, on which metal copings –with loops- were fabricated. Samples were divided into four groups according to P/L ratio of GIC cement used (Ketac-Cem, 3M ESPE, USA), for coping cementation; group A; 1 scoop/1 drop, group B; 1 scoop/2 drops (control), group C; 1.5 scoops/1 drop and group D; 2 scoops/1 drop. Samples were submitted to a tensile test using a universal testing machine (Instron 8874; Instron Corp. Canton, Mass) under a constant crosshead speed of 1.00 mm/min. Another 28 upper maxillary molar were embedded in transparent acrylic resin (Vertex- Dental B.V., The Netherlands). The blocks were trimmed to expose dentine surface on which a 3x3 mm Cr-Co cubes with a thickness of 2 mm were cemented on them. Samples were also divided according to P/L ratio used. A mono-bevelled chisel shaped metallic rod attached to the upper movable compartment of testing machine traveling at cross-head speed of 0.5 mm/min was used to apply load on the side metal cubes attached to lower compartment, for shear bond testing. All data was collected and statistically analyzed. Results: The highest mean value was observed in group C (409.25 MPa) and the lowest mean value was observed for group A (235.69 MPa). Statistical analysis revealed significant difference between groups (P= 0.010). Statistical analysis among groups showed significant difference between groups A and C (P= 0.017), between groups B and C (P= 0.003) and between groups B and D (P= 0.033). But no significant differences were found between groups A and B (P= 0.879), groups A and D (P=0.062) or between groups C and D (P= 0.731). (Table 3) Regarding shear bond strength, the highest mean value was observed in group A (8.39MPa) and the lowest mean value was observed for group B (1.06 MPa). Statistical analysis revealed significant difference between groups (P= .000). Statistical analysis among groups showed significant difference between groups A and B (P= 0.000), between groups A and C (P= 0.002), between groups A and D (P= 0.001) and between groups B and D (P= 0.032). But no significant differences were found between groups B and C (P= 0.063), or between groups C and D (P= 0.870). Conclusions: Within the limitations of the study it could be concluded that, the increase in the P/L ratio to 1.5 scoops/1 drop or 2 scoops/1 drop improved tensile and shear bond strengths Of hand mixed GIC than the manufacturer’s recommendation. The 1 scoop/1 drop group improved shear bond strength but not tensile strength of hand mixed GIC than the manufacturer’s recommendation. Keywords: GIC, Cement, P/L ratio, Shear bond strength, Tensile strength.