SPI intercoat and ppg dbc 500

W

wca_tim

Member
How similar is spi's intercoat to dbc500? as in can it be used to blend ppg color like the 500 is? or will it microphase phase separate / become cloudy at some point?
 
I have been using SPI intercoat with PPG DBC for about 8 months now. One coat before any metallic base and also mixed 1-1 with metallic base to blend. It has consistently provided excellent results. Never had any problems at all. Excellent product. ( Have also used it with Nexa.) I also prefer to use SPI reducer in the DBC and the intercoat.

Good to see another Tar Heel on the forum.
 
I've used the spi intercoat with any base and never had any problems-all good.
 
WCA the spi intercoat will be very similar to the DBC500.. It may even perform better.. Both are great products.. If you are using the DBC500 I think you will find the spi intercoat to be just as good albeit better truth be told.. Dont tell PPG this.. They hate these bathtub products we use :cool:
 
thanks for the replies! I'll at least try it for situations where I'm not going to blend with ppg base coat.

I know that many times when you dissolve two polymers (plastics, high molecular component of resins, etc...) together in a solvent and then let the solvent evaporate, the majority of combinations will not be completely misciible once the solvent evaporates -this would be especially true in non catalyzed systrems where you don't have chemical crosslinks to keep the different components from phase separating.

Note that some degree of phase separation is normal and even desirable - it is one of the factors behind the incredible performance of todays clear coats - but if the size of the different regions gets near the wavelength of visible light, thenj it gets cloudy... Many resins would phase separate on a much larger scale than that.

from what I read above, spi's interecoat and dbc500 miust be close enough in composition to be miscilbe / compatible even when mixed together. I'll probably give it a try and report back down the road.

the specific applications I'm thinking of are mixing bdc 9700 (black) 1:4 with bdc 500 or spi intercoat and including some large grain silver pearl and shooting a few coats of that over black. It works great with dbc5oo and gives a deep, deep looking black with some subtle sparkle in it. The other would be to add a little dbc9700 1:10 or so with intercoat and use it to tint tail light and marker light lenses... that also works great with dbc500.

If I wanted to give the intercoat a little more strength and adhesion, would I add a small amount of activator to it? if so, which one, how much, etc... Thanks!
 
What you are wanting to do will work perfect with the intercoat.

Yes any clearcoat activator at a rate of one ounce per mixed quart will do wonders, buy the way it is polyol rich and could easily handle two ounces but no real need as one does the trick really well.
 
wca_tim;6542 said:
I know that many times when you dissolve two polymers (plastics, high molecular component of resins, etc...) together in a solvent and then let the solvent evaporate, the majority of combinations will not be completely misciible once the solvent evaporates -this would be especially true in non catalyzed systrems where you don't have chemical crosslinks to keep the different components from phase separating.

Note that some degree of phase separation is normal and even desirable - it is one of the factors behind the incredible performance of todays clear coats - but if the size of the different regions gets near the wavelength of visible light, thenj it gets cloudy... Many resins would phase separate on a much larger scale than that.
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Welcome to the forum! Let me be the first to say that you are talking over my head here, but I would not mind hearing more technical info about phase separation and the chemistry of the various polymers we use in auto refinish work.

I have been mixing SPI intercoat directly into Sherwin Williams Ultra 7000 basecoat with good results, aside from some problems with certain medium metallic colors that I can't attribute to anything specific.

Intercoat also seems to work well as an initial coat on blend panels, to help subsequent applications of metallic orient properly.
 
not over your head - just from a different background / perspective. I'm a chemist and so come at it from a molecular perspective, you're a painter ad so come at it from a practical / hands on perspective. One is no "higher" than the other, just different.

Thanks for the input, and thanks barry for the pointer on activator...

I thought about titrating the intercoat if you didn't have a good off the top info, thanks for saving me the hassle... Cheers!

crashtech;6544 said:
Welcome to the forum! Let me be the first to say that you are talking over my head here
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wca_tim;6628 said:
not over your head - just from a different background / perspective. I'm a chemist and so come at it from a molecular perspective, you're a painter ad so come at it from a practical / hands on perspective. One is no "higher" than the other, just different.

Thanks for the input, and thanks barry for the pointer on activator...
Click to expand...


Very well spoken sir.. Looks like you have found yourself a nice home here.., Mr. Kives is a chemist himself.. Im sure your all's conversations would make me scratch my head and just reach for the bottle of Bourbon lol
 
wca_tim;6542 said:
thanks for the replies! I'll at least try it for situations where I'm not going to blend with ppg base coat.

I know that many times when you dissolve two polymers (plastics, high molecular component of resins, etc...) together in a solvent and then let the solvent evaporate, the majority of combinations will not be completely misciible once the solvent evaporates -this would be especially true in non catalyzed systrems where you don't have chemical crosslinks to keep the different components from phase separating.

Note that some degree of phase separation is normal and even desirable - it is one of the factors behind the incredible performance of todays clear coats - but if the size of the different regions gets near the wavelength of visible light, thenj it gets cloudy... Many resins would phase separate on a much larger scale than that.

from what I read above, spi's interecoat and dbc500 miust be close enough in composition to be miscilbe / compatible even when mixed together. I'll probably give it a try and report back down the road.

the specific applications I'm thinking of are mixing bdc 9700 (black) 1:4 with bdc 500 or spi intercoat and including some large grain silver pearl and shooting a few coats of that over black. It works great with dbc5oo and gives a deep, deep looking black with some subtle sparkle in it. The other would be to add a little dbc9700 1:10 or so with intercoat and use it to tint tail light and marker light lenses... that also works great with dbc500.

If I wanted to give the intercoat a little more strength and adhesion, would I add a small amount of activator to it? if so, which one, how much, etc... Thanks!
Click to expand...

Just ran across this last night while browsing, and it made me think of a video that I saw recently

http://vimeo.com/13441687
 
Unbeknownst to the engineers of the era, the Turbo Encabulator was the first device to achieve above parity quantum phase detractor output.

I wonder what happened to wca_tim?
 
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