Curly
Member
If by fibre blade you are speaking of fibreglass reinforced abrasive discs, those are made for cutting metal, not wood or plastics. That would explain your "wonky ends". Those discs work by shedding abrasive particles as they cut. The wood and plastics are not hard enough to expose new particles so the edges don't cut. Were you getting burnt or melted ends on the blanks? Get a saw blade made for miter saws and your cuts are going to be worlds better than what you are doing.