I have the HF unit. It works quite well. BUT... just be aware that soda blasting makes a HUGE mess. If you're going to do it tent the boat with plastic sheet, and make sure you have plastic on the ground also. You'r going to have this white powder all over the place. That being said, soda blasting is fairly fast and easy to learn, and it gets the job done with no damage to the gel coat as long as you keep the blaster moving. I'm sure the commercial units with the bigger gun orifice will do a quicker job, but for the one time use and then it sits for 5 years the HF unit fills the bill nicely.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer
1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer
1996 V21 w/1993 200HP Mercury on a Shoreline Trailer
All towed by a 5.7L Hemi Durango.
If God didn't have a purpose for us we wouldn't be here, so
Live simply, Love generously, Care deeply, Speak kindly.
(Leave the rest to God) 
Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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