The home team were relentless in perfect conditions and ran in a massive 16 tries to none while handing the Namibians another massive defeat.
iSG Pumas flyhalf Jacobus Marais had a telling day, contributing 27 points with a first-half try and 11 conversions from his educated boot.
The Windhoek Draught Welwitschias lost 81-8 to the Leopards in their last outing at the Hage Geingob Stadium in Windhoek and would have wanted to give a better account of themselves. But they came up against a team that pounced on their every error and punished them accordingly.
The visitors enjoyed very little possession in what turned out to be a procession of scores in a very one-sided affair. iSG Pumas centre Johann Vermaak started the carnage with a second-minute try converted by Marais, and six more converted tries saw the Lowvelders lead 49-0 at halftime.
iSG Pumas No 8 Marco Palvie crossed the tryline twice after the break to complete his hat-trick for the afternoon, while Jean-Paul Lewis (right wing) scored two second half tries and Henko Marais (centre) scored either side of halftime to also claim a double.
Former Springbok looseforward Hilton Lobberts also dotted down twice to complete a rout the Namibians would want to quickly want to forget.
ISG Pumas 106 (49) - Tries: Johann Vermaak, Jean-Paul Lewis (2), Jacobus Marais, Henko Marais (2), Marco Palvie (3), Piet-Louw Strauss, Etienne Taljaard, Phumzile Maqondwana, Hilton Lobberts (2), Giovanne Snyman, Carel du Preez; Conversions: Jacobus Marais (11), Ashlon Davids (2).
Windhoek Draught Welwitschias 0