Turning to the more recent past, I want to share some thoughts about mounting tires.
I chose GK SK+. which are reputedly difficult. I lubed the bead area with 20:1 dish soap and water. I seated the beads with valve cores removed. Lacking a good method of injecting sealant though the valve stems, I broke the bead on one side. This is sub-optimal, and resulted in loss of sealant while seating the bead a second time. The liberal application of soapy water didn’t appear to hurt the sealant at all. Once the bead seated a second time hardly any sealant weeped out.