login   |    register
AFV Painting & Weathering
Answers to questions about the right paint scheme or tips for the right effect.
thinning Valejo Model Color
southpier
Visit this Community
Alberta, Canada
Joined: December 11, 2009
KitMaker: 546 posts
Armorama: 316 posts
Posted: Tuesday, July 30, 2019 - 01:58 PM UTC
after reading (3) pages of search results, I still couldn't find an answer to my question.

when i'm caught without the correct color in the MA line, and have to jump into MC paints, I understand how to get it thinner in order to airbrush it.

Q: how long does thinned paint maintain its covering & drying properties?

I have some 5 year old paints, and I would be happy to thin the whole bottle if it wouldn't compromise the qualities or reduce its shelf life to 10 days.

thanks
Armorsmith
Visit this Community
Pennsylvania, United States
Joined: April 09, 2015
KitMaker: 1,063 posts
Armorama: 1,000 posts
Posted: Tuesday, July 30, 2019 - 02:37 PM UTC
Thinning the paint will shorten its shelf life. Best to thin what you will use in a reasonable time. How much shorter the shelf life depends on the type of paint and the thinner to paint ratio.
jon_a_its
Visit this Community
England - East Midlands, United Kingdom
Joined: April 29, 2004
KitMaker: 1,336 posts
Armorama: 1,137 posts
Posted: Tuesday, July 30, 2019 - 09:10 PM UTC
Here is my 2c/Tuppence H'apenny worth...

Vallejo ModelAir, needs thorough shaking/mixing, I put a few 3mm stainless steel nuts/BB's in it.

I also use a little of their Airbrush 71.161 THINNER, AND 71.262 Airbrush Flow Improver & sometimes 597 Retardante/slow dry.

With ModelColor (MC) the above thinner/flow improver/slow dry are essential, for air or brush painting, but their original 061 diluyente/thinner is intended only for brush painting.

Please be aware that MC will colour shift lighter when thinned well enough for spraying and both MC and MA are prone to tip dry.
Good luck.
southpier
Visit this Community
Alberta, Canada
Joined: December 11, 2009
KitMaker: 546 posts
Armorama: 316 posts
Posted: Tuesday, August 06, 2019 - 01:26 PM UTC
thanks for the guidance (both replies). "it's a process".
jon_a_its
Visit this Community
England - East Midlands, United Kingdom
Joined: April 29, 2004
KitMaker: 1,336 posts
Armorama: 1,137 posts
Posted: Tuesday, August 06, 2019 - 10:46 PM UTC

Quoted Text

thanks for the guidance (both replies). "it's a process".



That it is...
although I've gone back to using Tamiya acrylic with X20a thinner, and MIG's for ease of use as they are a lot more forgiving of my kack-handed efforts.
panzerbob01
Visit this Community
Louisiana, United States
Joined: March 06, 2010
KitMaker: 3,128 posts
Armorama: 2,959 posts
Posted: Monday, August 19, 2019 - 10:32 AM UTC
I've recently discovered and used Model Color. It's all via the AB.

I'm in Arizona... Things are often DRY here. Any paint thru an AB is going to challenge the tip-dry deities.

I thin the MC generously (around 2:1 or even 3:1 or a bit more) with generic blue galss-cleaner (generic "Windex") which contains ammonia plus a wetting agent. In general, I shoot the mix around 15 psi over a 0.35 to 0.5 needle for almost every use from broad coverage to under 1/8 lines. Back off the psi some for the finer work - down to maybe 10 psi.

Some suggest adding a flow-enhancer and / or a retarder. The blue glass cleaner stuff serves as a sort of combo. I am going to try adding some "Liquitex" to my usual thinned mixtures to explore the flow-enhancer effects.

Tip-dry happens. Unless you really "up" the local humidity, you will eventually suffer the drying while you work. I've taken to keeping tiny bristle-brushes ("micro-brushes") on hand to brush clumps off the needle. Shooting with lower psi helps hold this back. I have also used a wet "scrubber pad sponge" as a de-clumper dry needle treatment. Just stab the needle into the wet spomge and twist it around a bit to clean off the needle.

Cheers! Bob
Belt_Fed
Visit this Community
New Jersey, United States
Joined: February 02, 2008
KitMaker: 1,388 posts
Armorama: 1,325 posts
Posted: Monday, August 19, 2019 - 01:07 PM UTC
https://youtu.be/PIvY1_dAsaY
southpier
Visit this Community
Alberta, Canada
Joined: December 11, 2009
KitMaker: 546 posts
Armorama: 316 posts
Posted: Monday, August 19, 2019 - 02:11 PM UTC
interesting video and brings about (of course!) another question:

I've seen ump-teen video & other references where a hair drier is used.

Q: does speeding the drying artificially reduce the paint's bond to the material being painted or previous coat?

thanks
Belt_Fed
Visit this Community
New Jersey, United States
Joined: February 02, 2008
KitMaker: 1,388 posts
Armorama: 1,325 posts
Posted: Monday, August 19, 2019 - 02:44 PM UTC
None that I'm aware of
Owengate
Visit this Community
United States
Joined: June 03, 2019
KitMaker: 73 posts
Armorama: 39 posts
Posted: Tuesday, August 20, 2019 - 03:52 AM UTC
Definitely learned a lot from that video. Thanks!