When reading rust converter reviews, look at the reviewer's account and whether he gave an in-depth explanation of his star rating for the product. It is possible for some to leave reviews without even using or purchasing the product, so make sure that the review states that the item was purchased.
Rust converter is a product that chemically changes rust into a durable black paint that protects the metal underneath and prevents further decay. There are many products on the market, especially those geared towards the automotive industry.
When looking at reviews of products, it is important to determine if the review is paid for by the manufacturer or not. This can be indicated by a purely positive review that provides a long, in-depth story about the product. Reviews that are more realistic tend to provide both a positive and negative side to the rust converter. Another key factor is looking at all of the reviews for an overall impression of the product. A larger number of positive reviews is a good indicator that the rust converter works well.
Ideally, there will be a review left by someone who has used the rust converter for a similar purpose such as repairing rust spots on a car. Read through the review for a description of how well the product worked, of whether it affected other non-rusted parts of the car and to get an idea of how long it protected the metal, if possible.