Sanding Acrylic Enamel?
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Laughing Gas
Joined: Jan 2002
Posts: 1,008
Likes: 1
From: Tucson
Sanding Acrylic Enamel?
I'm two toning my truck (top white, bottom red). I'm following directions explicitly but I've still managed to get some gritty areas on the top. The last time I painted a truck was 25 years ago and I recall having the same problem. Anyhow, I'm using Centari paint and Nason catalyst along with some reducer. Anyhow, the auto paint store tells me that I can sand away the gritty areas with 1200 grit and the paint will get real glossy. I'm looking for some affirmation or another idea. Thanks. BTW, tomorrow I'm doing the red. Wish me luck!
jor
jor
Elder User
Joined: Mar 2003
Posts: 999
Likes: 1
From: Willamette Valley Oregon
<cr>
Assuming you put enough paint down to sand, you can sand with 1200. It won't get glossy though until you buff out the 1200 sanding marks.
It sounds like dry spray unless you are talking about dirt in the paint. Dry spray can be caused by a a number of factors including..
Incorrect paint viscosty, wrong reducer or too fast of reducer, spraying too fast, air pressure too high, spray gun too far from surface, lack of reducer, inadequate gun setting.
Assuming you put enough paint down to sand, you can sand with 1200. It won't get glossy though until you buff out the 1200 sanding marks.
It sounds like dry spray unless you are talking about dirt in the paint. Dry spray can be caused by a a number of factors including..
Incorrect paint viscosty, wrong reducer or too fast of reducer, spraying too fast, air pressure too high, spray gun too far from surface, lack of reducer, inadequate gun setting.
Last edited by Aekisu; May 1, 2004 at 09:26 PM.
Thread Starter
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Laughing Gas
Joined: Jan 2002
Posts: 1,008
Likes: 1
From: Tucson
Yea, I got plenty of paint down. I'm not sure what I'm doing wrong. It's like heavy overspray. I don't have the problem on the pillars or around the sides of the top so I'm hoping the red goes better tomorrow in that I can reach everything. I think part of the problem is that I couldn't see real well as I had the truck under a canopy with partial sides. Tomorrow for the red, I'll have it all out in the open. Thanks for your reply. I'd be interested in hearing from anyone else on this issue too.
jor
jor
Last edited by jor; May 1, 2004 at 09:41 PM.
Thread Starter
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Laughing Gas
Joined: Jan 2002
Posts: 1,008
Likes: 1
From: Tucson
It sounds like dry spray unless you are talking about dirt in the paint. Dry spray can be caused by a a number of factors including..
Incorrect paint viscosty, wrong reducer or too fast of reducer, spraying too fast, air pressure too high, spray gun too far from surface, lack of reducer, inadequate gun setting.
Viscosity: I don't think this is the problem in that I am mixing it according to the directions (8 : 4: 1)
Too Fast: This could be the problem
Too Far Away: I'm trying for eight inches or so
Lack of Reducer: I'll add more tomorrow
Gun Setting: I'm setting it at about 42#. The store recommended 45-50 but most everyone else says 40#. Do you think I should set it higher?
Thanks.
jor
Incorrect paint viscosty, wrong reducer or too fast of reducer, spraying too fast, air pressure too high, spray gun too far from surface, lack of reducer, inadequate gun setting.
Viscosity: I don't think this is the problem in that I am mixing it according to the directions (8 : 4: 1)
Too Fast: This could be the problem
Too Far Away: I'm trying for eight inches or so
Lack of Reducer: I'll add more tomorrow
Gun Setting: I'm setting it at about 42#. The store recommended 45-50 but most everyone else says 40#. Do you think I should set it higher?
Thanks.
jor
Senior User
Joined: Nov 2003
Posts: 279
Likes: 0
From: northern Ky
IMHO with Centari if you have dry gritty areas, wait a day, sand the gritty areas with 400, mask the rest of the truck largely with plastic, and respray them. It will take less time than getting all that color sanding and buffing to match the rest of the truck.
Elder User
Joined: Mar 2003
Posts: 999
Likes: 1
From: Willamette Valley Oregon
<cr>
Just thought of another possiblity. Don't know if it applies to you.
Normally, your next pass of paint is put directly over the previous pass, with a 50% overlap. If you started in the middle of the top, working towards the outside and then walked around to the other side to finish the top, the first 1/2 may have flashed long enough that your new paint couldn't blend in.
For me, dry spray is usually is caused by one of three problems. They are...
Working in warm conditions with too fast of reducer.
Losing my concentration and pulling my gun away from the surface.
Going too fast.
Just thought of another possiblity. Don't know if it applies to you.
Normally, your next pass of paint is put directly over the previous pass, with a 50% overlap. If you started in the middle of the top, working towards the outside and then walked around to the other side to finish the top, the first 1/2 may have flashed long enough that your new paint couldn't blend in.
For me, dry spray is usually is caused by one of three problems. They are...
Working in warm conditions with too fast of reducer.
Losing my concentration and pulling my gun away from the surface.
Going too fast.
