The consumer fraud laws apply to the sale and servicing of boats. 

Servicing:  All the rules that apply to car salesman apply to boat repairs.

Consumer fraud in boat repairs:

    no signed authorization for repars;
    charging more than the promised amount or higher than the written estimate;
    not advising if a new engine is rebuilt or new.

Failure to comply with any of these regulations creates a per se violation of the consumer fraud act.

New Jersey Consumer Fraud Act
The New Jersey Consumer Fraud Act is one of the most powerful laws in the country for consumers. It provides for triple damages and attorney fees if successful litigation is started and completed. The statute is remedial and is to be liberally interpreted in favor of consumers.
(please read my blog for some very long posts in this area)

Under what circumstances can you sue?
    If the seller lies about a material fact (e.g., tells you the boat never sunk);
    if the seller omits an important fact (e.g., never tells you the boat sunk);
    if the seller engages in deceptive conduct (e.g., pays off the surveyor).