Spraying Gel - 9:1 vs 13/15:1 - Possible???

Curious if anyone has sprayed gel with a 9:1 system with any luck? I know 13 or 15:1 is preferred but just curious if it would work out ok in a pinch for one project while I sort out a new replacement for a gel-specific option. This would be sprayed into a mold for a mid-sized boat, not a repair. Thoughts?

Also if you had to choose between 9:1 spray system or pressure pot (pre-mix) which route would you choose? Thanks!

 

It can be used with good results, but your tip size needs to be reduced and your ability to keep a wet edge comes into play.

What is a mid-sized boat in your view?

 

Boat is 28’ so quite a mold to consider using a pressure pot on so I’m leaning towards the 9:1 system. Just arrived so going to try some small parts first.

was looking for feedback on anyone that’s used the 9:1 with gel and had success.

 

Keeping the gel coat warm will help a great deal. I used an 11:1 on parts that size with excellent results, but I used an inline heater most of the time.

 

It can do it, but you'll have to run the drive pressure VERY high and the material needs to be maintained at 77F or above to keep viscosity low.

Gelcoat typically need 700-1200 psi fluid pressure to atomize properly depending on tip size.

Meaning, you'll need to run your air drive pressure at 80-100 psi. Keep spare service kits around, your seals will last 3-6 months at that drive pressure.

Use a 418 tip. Do not use anything larger than 0.021" orifice, it will be difficult for the pump to keep up while maintaining fluid pressure.