I have the Harbor Freight 4x6 bandsaw which I think is the same as the Warco. It was a revelation to switch from the cheap HF carbon steel sawblades to the usual bimetal 10-14 variable pitch. MUCH longer blade life and it really cut well through steel.
However, my recent experience trying to cut through 2" or 3" wide blocks of aluminum were very poor. Took forever. Even with coolant to help remove chips, etc. Results were so poor that I took to melting down thick aluminum into ingots for castings , rather then try to cut it on the saw to use as is. I assumed the saw just couldn't deal with heavy sections.
Not sure what was wrong. Could have been the particular blade, I suppose. Anyway, out of curiosity I switched to a Harbor Freight cheapo 10 pitch carbon steel blade, and suddenly it began to cut right through the thick aluminum like the bi-metal cut steel.
Since I had 3 of these HF blades, unused, and just taking up space, I'm quite happy to get some use out of them. The plan is therefore to use the bi-metal most of the time, but when cutting heavy aluminum sections, switch to the HF carbon single pitch blades.