Is it OK to weed whack when the grass / weeds are wet? I know that safety issues would be to be careful not to slip and fall. But, is there any reason to not use the weed whacker on wet grass? Does it not cut as good? Would wet grass hurt the machine? We need to do a job tomorrow or Tuesday but there is a chance of thunder storms. The job is to whack down a huge field that is very high - some of it waist high. I know we would not get out there in the rain, but since we must get the job done before Wednesday - then is it OK to weed whack wet weeds/grass? Thanks.