Machine mixing and hand mixing are the only industry recognized methods for mixing sectionalized containers (Semkit®) as referenced in SAE AIR4069 and Boeing BAC5000. Mixing outside of these controlled and validated procedures has the potential to alter the sealant performance or even damage the sealant itself.
Testing shows that mixing with a drill adapter has several definitive detrimental effects on the sealant: Uncontrolled mixing speed will excessively heat the sealant and greatly reduce the working time of the sealant, and will decrease the extrusion rate below specification-required values. The high torque and shear induced with a drill may also damage certain raw material ingredients in the uncured wet sealant, irreversibly degrading the anti-sag properties of the wet sealant, or the density of the cured sealant.
Low density sealants are especially affected by drill mixing. Any of these negative effects may cause the sealant to perform outside of specification requirements, and will therefore void the certification and/or warranty. Mixing with a drill adapter also presents significant safety concerns, as there have been documented cases of user injury when mixing a Semkit ® with a drill.