Machined Aluminum Mold Blocks. Hard Anodized Sprue Plate. Rust resistant aluminum blocks. Lee Precision does not recommend the use of any spray type mold release products in their bullet molds. The use of such products may result in a build-up of the release product in the bullet mold cavity, reducing the diameter of the bullets cast from the treated mold. Instead, Lee Precision recommends smoking the mold with a wooden match, beeswax candle or a butane lighter as described in their provided bullet mold instructions.