Select items like records from a column in another table

I have a table (foo) with a large number of several records and I only want to select those that are like one of the records in a field in another table (foo2)

If I do a SELECT query with an inner join

SELECT pst_qty AS [QTY]
  ,[MFGPN]
  ,[mfg_name] AS [MANUFACTURER]
  ,description
  ,sup_id
  FROM [foo]
  INNER JOIN [foo2]
  ON [foo].[MFGPN] = [foo2].TestString

afaik I would only get records where foo.field1=foo2.field1. I can't seem to use ON foo.field1 LIKE foo2.field2 to select records like the fields in foo2. How would I go about selecting the records that are like the records from a column in a different table?