I have added a sixth race car last year and by the time Oct 1st rolled around I had all the sponsorship logo space sold. Small companies you can do anytime, most major sponsors like all their ducks in a row by Oct 1st at the latest.
I was at two office supply-janitorial supply-office furniture shows in JUNE this year , one in Denver and one at South Beach Miami and picked up THREE major "advertisers" for all six race cars and all six race car trailers. I hardly have enough space for the logos, however I am going to redo all the logos on the race cars this winter.
If you plan on attending the PRI Show in Orlando in December, don't plan on any response from anyone until 2011. I am constantly working on getting new advertisers as there is a constant turnover. I have had some for over 20 YEARS!! and some will last three and they want to try something new. Once I get an "advertiser" however I usually keep them for many years.http://racingsecrets.com/sponsorship_coach.shtml