Help with gloss paint

Post your best modeling tips here.

Topic author
cristiano.molignoni
F3
F3
Posts: 17
Joined: Wed Nov 04, 2020 4:44 am
Your Name: Cristiano Molignoni
Favorite F1 Team or Driver: Nelson Piquet, Michael Schumacher
Location: Setúbal
Status: Offline
Brazil

Help with gloss paint

Post by cristiano.molignoni »

Hello

I wonder if someone can help with some tips about the gloss coat

In general flat and chrome paints are ok, but gloss always was a issue for me.

I use Tamiya Lacquer

Basically I have 2 questions:

1. Do you in general prefer - psi and + thinner or + psi and - thinner?
What I doing right now, I bought a precision scale and I mixing using the weight, not in ml or drops. For example I mix 2g of paint and 2g of thinner, for the gloss I'm using the retarder type. I usually can achieve the gloss effect but I usually spend a lot of paint, so I wonder if I'm doing something wrong.

2. This is for me the worst nightmare I'm not able to fix, is far away my biggest issue. Dirty, no matter what I do my paint always get dirty. I will put the photos attached so you can understand what I'm talking about. I have a spray both, I always use a Tamiya anti static brush tool to clean the model, but there is no way I got a paint without some dirty spots.
In case this is normal how do you actually fix this after the paint is dried?

In any case thanks a lot for your help :D

The images:

In general I ok with the gloss effect, I think I spend too much paint (in this case half of Tamiya 10ml bottle) so the reason my first question
IMG_3300.JPEG
Now the real nightmares:
IMG_3302.JPEG
IMG_3303.JPEG

Kind regards
Cristiano
User avatar

f1m
FIA President
FIA President
Posts: 1729
Joined: Sun Apr 30, 1995 1:00 am
Your Name: Eric Aitala
Favorite F1 Team or Driver: Ferrari
Location: State College, PA
Contact:
Status: Offline
United States of America

Re: Help with gloss paint

Post by f1m »

First is to get rid of the dust in the air.
  • MIst water into the air.
  • Run your spray booth and/or an air filter for a while before you paint.
  • When done spraying, cover the opening of the booth with a filter.
I just taped a standard air filter to the front of mine.
IMG_4286.jpg
E
User avatar

f1m
FIA President
FIA President
Posts: 1729
Joined: Sun Apr 30, 1995 1:00 am
Your Name: Eric Aitala
Favorite F1 Team or Driver: Ferrari
Location: State College, PA
Contact:
Status: Offline
United States of America

Re: Help with gloss paint

Post by f1m »

If you get dust in the paint, you may be able to polish it out... depends on how big / deep it is.

If that does not work, you will need fine sandpaper to sand it down, then respray.

E

Topic author
cristiano.molignoni
F3
F3
Posts: 17
Joined: Wed Nov 04, 2020 4:44 am
Your Name: Cristiano Molignoni
Favorite F1 Team or Driver: Nelson Piquet, Michael Schumacher
Location: Setúbal
Status: Offline
Brazil

Re: Help with gloss paint

Post by cristiano.molignoni »

f1m wrote: Tue Jun 14, 2022 4:02 pm First is to get rid of the dust in the air.
  • MIst water into the air.
  • Run your spray booth and/or an air filter for a while before you paint.
  • When done spraying, cover the opening of the booth with a filter.
I just taped a standard air filter to the front of mine.
IMG_4286.jpg

E
Hi Eric, thanks a lot, I will for sure tey the first 2. About the filter I already have it.

And I try to sand it but do you believe is possible to get a descent result if I sand the local and paint again only in the local? Trying of course using the same paint mix I used in the first paint try?

thanks a lot again

Kind regards
Cristiano
User avatar

f1m
FIA President
FIA President
Posts: 1729
Joined: Sun Apr 30, 1995 1:00 am
Your Name: Eric Aitala
Favorite F1 Team or Driver: Ferrari
Location: State College, PA
Contact:
Status: Offline
United States of America

Re: Help with gloss paint

Post by f1m »

I'm not sure, it really depends. I've seen lacquer paint blend pretty well with the previous coat. I think overspray will be the biggest problem. You might need to polish out the larger area to blend things together.

E


And I try to sand it but do you believe is possible to get a descent result if I sand the local and paint again only in the local? Trying of course using the same paint mix I used in the first paint try?

Kind regards
Cristiano
User avatar

AJP01
Minor Constructor
Minor Constructor
Posts: 939
Joined: Wed Apr 20, 2005 5:00 pm
Status: Offline

Re: Help with gloss paint

Post by AJP01 »

Eric is spot on.

In addition, your paint gloss seems to be pretty good even though it has some dust particles. Have you tried polishing with Micromesh pads in 3200, 4000, 6000, etc. finer grits just to see if the dust contamination polishes out? It will also help reduce orange-peel and get an even glossier smooth surface if it works, finishing off with Tamiya polishing compounds (Coarse, Fine, Finish sequence).

AJ
User avatar

CK
Constructors Champion
Constructors Champion
Posts: 1305
Joined: Mon Mar 06, 2006 9:38 am
Your Name: C K
Favorite F1 Team or Driver: Mercedes, McLaren, Williams
Location: Canada
Status: Offline
Canada

Re: Help with gloss paint

Post by CK »

Hi Cristiano,

It is an annoying issue. Getting the spray booth clear first is critical. I use my airbrush to spray around to get dust off surface first and than wait for the fan to suck it out.

I don't use lacquer paint much. I think it is still similar for different paint types. I usually have light coats rather heavy coats. I inspect for dust particles after each spray. If there are dirts on the paint, usually it is not embedded as the paint layer is thin. I will wait for the layer to become dry first. Then use a brush to try to brush the particle away. If it sticks to the paint, I will use 1500 grid wet sand paper to carefully sand it away.

I also put the surface being painted in vertical or slightly facing down during painting to prevent particles landing on it. Once spraying is done, I quickly put the object inside a cover for it the dry. This also prevent any more dust to land on the painted surface.

For the final layer, after sanding off dust particles,the paint can be just polish with polishing compound. Slow sanding with 1500 to 2000 grid wet sand paper is the way. Don't try to rush the sanding. You may not need to repaint, just polish it.

I also find painting is the least enjoyable step for me.

Hope you find some success.
C K
Canada

Topic author
cristiano.molignoni
F3
F3
Posts: 17
Joined: Wed Nov 04, 2020 4:44 am
Your Name: Cristiano Molignoni
Favorite F1 Team or Driver: Nelson Piquet, Michael Schumacher
Location: Setúbal
Status: Offline
Brazil

Re: Help with gloss paint

Post by cristiano.molignoni »

Thanks a lot for the comments

As I can see the most important is to try to clean my spray booth, I will also try some techniques you mentioned

After I try again I put my results here

About the spray both, I bought in the past a spray both from Benchvent, and it' pretty solid, but I looked in the site to buy a spare filter and for 3 spare filter + shipping to Portugal is about 90 pounds. Is it easy to find these type of filter in stores like Leroy Merlin?

Thanks again
Cristiano
User avatar

CK
Constructors Champion
Constructors Champion
Posts: 1305
Joined: Mon Mar 06, 2006 9:38 am
Your Name: C K
Favorite F1 Team or Driver: Mercedes, McLaren, Williams
Location: Canada
Status: Offline
Canada

Re: Help with gloss paint

Post by CK »

Hi Cristiano,

In Canada, we have air filter for furnace that are everywhere. They are cheap (~ 6 Cdn a piece). I'm not sure you have these at your location.
air-filter.jpg
You can cut them smaller or glue two pieces together to make it fit.
C K
Canada

Topic author
cristiano.molignoni
F3
F3
Posts: 17
Joined: Wed Nov 04, 2020 4:44 am
Your Name: Cristiano Molignoni
Favorite F1 Team or Driver: Nelson Piquet, Michael Schumacher
Location: Setúbal
Status: Offline
Brazil

Re: Help with gloss paint

Post by cristiano.molignoni »

Thanks CK

I will try to found here or at least looked for a online store

Thanks
Cristiano
Post Reply