Yacht Dr.
Vice Admiral
- Joined
- Feb 26, 2005
- Messages
- 5,581
Re: At the gelcoat stage - help needed!!!
Yep .. thats the one
.
" Am I right in saying that this step replaces the need for adding wax to the final coat of gel. As the PVA should seal the surface to make it air tight. "
Thats 2 for 2 yes..the pva replaces the wax..so no wax needed.
For a compressor I would have used a 5 hp with a 20 gal tank before ( sometimes it drops off in pressure and I have to wait for a minute .. but then again Im Jammin lol ) .
As JK said..the pressure pot is helpfull for gelcoat full sprays because your Forcing the fluid to the tip. Instead of Siphon where the air passing through the gun sucks the fluid from the cup..or your gravity fed gun where ..well gravity helps the fluid get to the tip. Pressure pot is the way to go.
When using the Pressure pot..if you even think that the fluid is seeming not to be coming out as much STOP visually check the gel to make sure its not kicking off. If it seems to be getting thicker you dont have much time to flush the gun.
" All the pressure pot systems I see come with a much smaller gun tip though ( 1.5 - 2.0mm ) Should this tip be changed to something in the 4.0 - 5.0mm range. Or should the tip be smaller because of higher pressure in this setup."
Nope .. a binks #66 tip is 1.8 mm ( thats what I had on my expensive gun before I started using the HF one ).
Plus .. If you want to change the tip..you would probably change the fluid nozzle and the air cap. unless its a high end gun I think it would be impossible to do.
As I said in the other post..you want a "cheater valve" at the gun to regulate the air pressure at the tip. Your fluid pressure is regulated by the pots OWN Regulator ( normally set from 8-12 lbs ).
Oops stated the same thing..kinda..he said "regulator between the pot and the gun". thats what i was saying..but you dont need a regulator persay..its a cheater
** You have 2 hoses in the system .. one black and one red. The Black one is the Fluid ( pot to the threads next to the head of the gun. The Red one is the Air feed to the gun ( thats where the cheater is installed..on the red hose At the gun ). The hoses have different thread sizes ..so you cant screw it up where to hook them to. **
Link for cheater and regulators and you get the picture : http://www.finishsystems.com/meteringvalves.html
( But I know what you ment Oops..just wanted to make sure he didnt put a reg at the gun )
Hmm..what else was there..
Oh..I would not practice with gel..too expensive. If you like to get the feel for how gel sprays...try buying some cheap house latex paint and use that to guage where your fluid/air settings are going to be.
Oh..I would also put a quick coupler setup on the end of your Air hose from the compressor to the pressure pot ( Female on the hose obviously ).
Any more questions just fire away.
YD.
PS. You can PM me anytime for private or personal matters .. Please keep thread related questions on the forum so everyone can hear .
PSS. You just have to give me some time to post to threads.. After I go to bed I dont really post untill I get home from work the next day ( while I do check out the forums on my silly phone at work ).
Yep .. thats the one
." Am I right in saying that this step replaces the need for adding wax to the final coat of gel. As the PVA should seal the surface to make it air tight. "
Thats 2 for 2
yes..the pva replaces the wax..so no wax needed.For a compressor I would have used a 5 hp with a 20 gal tank before ( sometimes it drops off in pressure and I have to wait for a minute .. but then again Im Jammin lol ) .
As JK said..the pressure pot is helpfull for gelcoat full sprays because your Forcing the fluid to the tip. Instead of Siphon where the air passing through the gun sucks the fluid from the cup..or your gravity fed gun where ..well gravity helps the fluid get to the tip. Pressure pot is the way to go.
When using the Pressure pot..if you even think that the fluid is seeming not to be coming out as much STOP visually check the gel to make sure its not kicking off. If it seems to be getting thicker you dont have much time to flush the gun.
" All the pressure pot systems I see come with a much smaller gun tip though ( 1.5 - 2.0mm ) Should this tip be changed to something in the 4.0 - 5.0mm range. Or should the tip be smaller because of higher pressure in this setup."
Nope .. a binks #66 tip is 1.8 mm ( thats what I had on my expensive gun before I started using the HF one
).Plus .. If you want to change the tip..you would probably change the fluid nozzle and the air cap. unless its a high end gun I think it would be impossible to do.
As I said in the other post..you want a "cheater valve" at the gun to regulate the air pressure at the tip. Your fluid pressure is regulated by the pots OWN Regulator ( normally set from 8-12 lbs ).
Oops stated the same thing..kinda..he said "regulator between the pot and the gun". thats what i was saying..but you dont need a regulator persay..its a cheater
** You have 2 hoses in the system .. one black and one red. The Black one is the Fluid ( pot to the threads next to the head of the gun. The Red one is the Air feed to the gun ( thats where the cheater is installed..on the red hose At the gun ). The hoses have different thread sizes ..so you cant screw it up where to hook them to. **
Link for cheater and regulators and you get the picture : http://www.finishsystems.com/meteringvalves.html
( But I know what you ment Oops..just wanted to make sure he didnt put a reg at the gun
)Hmm..what else was there..
Oh..I would not practice with gel..too expensive. If you like to get the feel for how gel sprays...try buying some cheap house latex paint and use that to guage where your fluid/air settings are going to be.
Oh..I would also put a quick coupler setup on the end of your Air hose from the compressor to the pressure pot ( Female on the hose obviously ).
Any more questions just fire away.
YD.
PS. You can PM me anytime for private or personal matters .. Please keep thread related questions on the forum so everyone can hear
.PSS. You just have to give me some time to post to threads.. After I go to bed I dont really post untill I get home from work the next day ( while I do check out the forums on my silly phone at work ).
