#31  
Old 05-19-2010, 03:06 PM
kebwi's Avatar
Il Pizzaiolo
 
Join Date: Aug 2009
Location: Seattle, WA, USA
Posts: 1,010
Default Re: Some SBC questions

Worked like a charm. I dry mixed the powder and the SBC, thoroughly shook it in a bucket, then wet mixed it with pre-50/50 acrylic fortifier.

The only problem I had is that I massively overestimated my initial color mix. I kept adding more color in because I thought it looked really pale as a dry mix. Then I wet mixed it and it got REEEEEALLY dark. So then I desperately tried to dilute the dry mix by adding more SBC back in. Then I went TOOO dilute and the next wet batch was too pale!!! Third batch was Goldilocks though.

In the end, it worked great, but don't judge the color by the dry mix, it will look much more "powdery" and unsaturated than the wet product...and the final cured product will be somewhere in between the two. Try a few small patches in areas that you will add multiple layers to before you're done. Converge on the right color, then go for broke.

I'm not sure gray would look "dirtier", just darker. You could achieve the same effect by purchasing a darker tinted color powder in the first place. Bear in mind that lightness/darkness are not the same color dimension as saturation, so using gray vs. white SBC probably isn't the same thing as adding more of the same color to the SBC. Gray SBC will look darker, more color added to white SBC will look more saturated ("richer").

That's exactly why I preferred white, so I could most easily control the effects of the color by simply purchasing the required hue and lightness and mixing to the desired saturation.
__________________

Website:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

WFO Webpage:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Thread:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


Last edited by kebwi; 05-19-2010 at 03:08 PM.
Reply With Quote
  #32  
Old 05-19-2010, 07:24 PM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 3,075
Default Re: Some SBC questions

It is not the same for sure. Most of the pigments (if you use their color card) are formulated for grey, so if you use white, you will get either a totally different color (yellows-buffs) or an over saturated one (reds-blacks).
Reply With Quote
  #33  
Old 05-19-2010, 07:33 PM
kebwi's Avatar
Il Pizzaiolo
 
Join Date: Aug 2009
Location: Seattle, WA, USA
Posts: 1,010
Default Re: Some SBC questions

But just to be clear, since I went through this when I bought the pigment, the color cards are not only for gray cement, they are for ordinary portland cement, or at best perhaps for conventional concrete mixes. SBC is different. In fact, all of these substances are different in their ratio of cement to total weight, usually in the range 10%-50% (I really don't know much about it).

The point is, the colors are prescribed by ratio of pigment to portland, not pigment to total, so if you really want to do it by the numbers (meaning with a calibrated color card), you have to know what fraction of your concrete/stucco/etc. is portland.

Basically, if you're coloring an unconventional substance (like white SBC as oppose to gray concrete), you may as wall just do it by trial and error anyway.

...but buy the desired HUE and to a significant extent the desired lightness. Just don't worry about saturation too much. Figure that one out the old fashioned way.
__________________

Website:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

WFO Webpage:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Thread:
To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.

Reply With Quote
  #34  
Old 05-19-2010, 07:52 PM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 3,075
Default Re: Some SBC questions

The important thing to do when using white whatever is to look at the pigment itself, NOT the color card, just to clarify further.
Reply With Quote
  #35  
Old 05-20-2010, 08:19 AM
Dino_Pizza's Avatar
Il Pizzaiolo
 
Join Date: Feb 2008
Location: Northridge, CA
Posts: 1,015
Default Re: Some SBC questions

Thanks, both you guys for the helpful info. And Keith, thanks for the lesson on hue and saturation. I'm on the right track with buying the white SBC.

I'm going to buy the "la habra stucco color" powders that Lowes and HD carry for pigments. The color cards displayed are numerous however they are all very light, very soft in color (saturation) since most people go for a lighter-pastel look on their home (not to mention most people are afraid of color...that's another subject...).

So, I'll buy the color of the powder in the bags and go by trial and error to get my perfect mix. It's only for the back of my oven-haus and the interior of the wood storages that are visible. Painting the SBC is a last resort, but an option I'll try to avoid. Thanks, Dino
__________________
"Life is a banquet and most poor sons-of-bitches are starving to death." -Auntie Mame

View My Picasa Web Album UPDATED oct

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


My Oven Costs Spreadsheet

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.


My Oven Thread

To view links or images in signatures your post count must be 0 or greater. You currently have 0 posts.
Reply With Quote
  #36  
Old 05-20-2010, 08:26 AM
Tscarborough's Avatar
Il Pizzaiolo
 
Join Date: Oct 2009
Location: Ausitn
Posts: 3,075
Default Re: Some SBC questions

The La Habra is formulated for a 90# bag of material, aggregate included, so if you are using just the color packs in SBC, adjust accordingly. If they are 50# SBC, for example, 1 color pack to 2 bags SBC is probably close enough.

Also note which base the color pack calls for, base 100 is white, base 200 is grayer.

Last edited by Tscarborough; 05-20-2010 at 08:29 AM.
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Starting my foundation questions? Italfranco1 Pompeii Oven Construction 17 07-15-2012 04:16 PM
First Post - A Few Questions mpholland Pompeii Oven Construction 1 12-15-2008 04:54 PM
Questions on installing Toscana90 giambra Getting Started 1 10-15-2008 11:42 AM
Newbie List of Questions TBM66 Getting Started 29 03-10-2008 01:58 AM
Questions, Questions, Questions Dan94550 Tools, Tips and Techniques 28 10-23-2007 09:10 AM


All times are GMT -7. The time now is 04:55 PM.

Powered by vBulletin® Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
2006/10 Forno Bravo, LLC