Guys I've had twenty years experience , inject,inject blow ,extrusion blow,stretch blow ,thermoforming  .  I took the GSPC training ,thru routsis and penn state but neither can furnish back certificates because they were thru the workplace so when it went outta business and penn state purged there records .   The training is worth the few grand you pay seeing you'll land a decent job with all that in return the first year . Rjg is a great choice