This is the last of 4 batches in a Coopers kit before trying AG (an APA fermenting now). It is a Mexican Cerveza and this is the most care I've taken so far; sanitised everything, sterilized bottles in oven, etc. (maybe that's a clue because it tastes like oven-cleaner chemical!). This is not just an off flavor, it's an awful chemical taste. I forced myself to leave it 3 weeks in primary then 1 day in the racking bucket. Tried so hard not to splash during siphoning. Batch primed using boiled table sugar. Tasted at 1, 2, 3 weeks and yuckkk!