Vinyl and Linoleum Flooring - heat weld nora rubber flooring

JOB 4" flash cove . 2mm rubber sheets with heat weld seamless finsh in patient rooms. i have 17 years exp in com flooring. 15 years of heat weld exp. i am having a hard time welding out side corners with boot methed.Tried everything to get smooth weld finsh on the outside corners but still seems to be rough welds . plastic beed dose not smooth out like vinyl beed. i am welding corner with weld beed feed roller letting it cool for 5 min cut with bent moon knife with a littel heat. but i can't re melt for smooth corner, one shot and done only way. any ideas wecome

nora produce a preformed flash cove section for inside and outside corners to join onto the straight lengths. If you are self coving the noraplan sheet rubber material you should be cutting butterfly sections and welding on the flat rather than on the apex of the outer junction. Rubber weld rod is not the same as PVC and behaves more loke the weld rod you get with marmoleum. You need to drop the heat setting on the heat gun to 4 normally just to get it to flow. Your not looking to get "peel up" or "fusion" like in a vinyl weld.

thank for the reply. nora has stoped making the premolded sanitary corners. architect spec. intergral flashcove through out patient rooms only.i did as you said from the start but the hard part was retriming of the weld on outside corners. best i could do was reheat and trim square. architects said not acceptial. all other rooms are sanitary base with cold weld, same color as heat weld.i am useing cold weld on corners and wall seams . for outside welds i have 1" putty knife with 90 angle cut out of it ,rounded 1/8" in center. next day trim up with x-acto and use sand paper to round out side corner, then apply wax. all so started using "turbo welding tools" heat sensitive welding tip, gun set at 9,trim 1 pass and come back next day for final cut and clean caulk working very well for me.