Household lubricant and cleaning products maker WD-40 Co (WDFC.O) posted a better-than-expected quarterly profit but cut its full-year forecasts, as it deals with a deteriorating economy and volatile raw material costs. While prices of certain raw materials such as oil and steel have fallen, the price of tinplate, a primary cost, has risen substantially, the company said. The San Diego-based company now expects 2009 earnings of $1.60 to $1.75 a share on sales of $305 million to $315 million, c...