In agreement with theoretical approximations, improving the strength of a twisted nanotube yarn requires nanotubes which are longer, have smaller diameters, and have a high coefficient of friction between the nanotubes. To this end, the goal of this work is to evaluate continuous yarns prepared from spinning ultra-long (~5 mm) multi-walled carbon nanotubes (MWNTs) from forests and subsequent infiltration with small amounts of epoxy to improve friction between component nanotubes. Ultra-long (>2mm) carbon nanotube (CNT) forests were grown using a floating catalyst chemical vapor deposition (CVD) growth method. This method provides a continuous feedstock of the catalyst particles which enables growth of dry spinnable ultra-long CNT forests. We found that the tensile strength doubled with the infiltration of Epon 862. Specific strengths were measured up to 3 GPa with a specific modulus of 180 GPa and a 4.2% strain-to-failure using 10 wt% Epon 862 in acetone concentration. We also show scalable methods for producing CNT yarns using ultra-long nanotubes which cannot be spun from dry forests and improvements in mechanical performance by crosslinking the component nanotubes with thermal and chemical treatments.