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Old 05-20-2005, 02:13 PM
Max Wedgie
 
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Sealer Needed or Not?

Ready to start shooting this weekend. Car is ready and in the booth. Need to know whether or not a sealer coat is needed before I shoot the base and clear. I currently have a foundation of PPG DPLF epoxy 1 wet coat (this is over a 8 month old PPG AE topcoat that had orange peel), 2 coats of K36 blocked and smooth. I was planning on spraying a sealer coat of K36 (mixed according to P-Sheet) but am wondering if it is really necessary? BC/CC will be DBC and Global 894. Temp is about 65-70. I didn't really to mess up a perfectly smooth and flat primer job by applying a sealer with my primer gun and maybe getting some orange peel unless it is necessary to seal.
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Old 05-20-2005, 02:26 PM
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Unless you need a sealer for hiding color, I would not as it sounds like you did everything perfectly.
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Old 05-20-2005, 02:33 PM
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The k-36 is a light grey. I will be shooting a bright red (64 Chrysler). From what the PPG rep told me " the tinting color you add to the K36 sealer will make it turn out kind of pinkish". Will it help to achieve hiding?
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Old 05-20-2005, 04:01 PM
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Right, it will make the K36 pinkish. This might be a positive in that stone chips down to the primer will not show up as bad. I would not count on it taking less base to cover however. You still need about 3 good coats.

Vince
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Old 05-20-2005, 06:40 PM
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I would NOT tint the sealer!!
It will be PINK, not some hue of red but true pink. Plus that fire red is a deep red, imo that pink sealer if chipped would stand out like a sore thumb. 3 coats will cover but a fourth for safety measure would be a good idea...Eric
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Old 05-20-2005, 08:43 PM
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Skip the sealer IMO. Make sure all areas of your K36 are sanded and or scuffed with a scotchbrite and put your color on. Did your paint rep recomend DBC with the Global 894 clear? Bob
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Old 05-23-2005, 01:53 PM
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PPG makes a good enough product that a few good coats will cover without the need for tinting. I tinted K-36 with red for my red Trans Am but found it didn't need it anyway. (and the tinted sealer was a nasty Pepto Bismol Pink) But I would not even think about skipping the sealer coat. I guarantee that after all that careful block sanding, there is at least one or two spots where you sanded through your blocking primer, either to bare metal or bondo. When you paint over existing primer or paint, it will chemically "dig in" to what's underneath it. This can cause a noticable solvent ring on the transition area from metal to blocking primer.
By putting on a sealant coat you are also saving yourself from any sand scratches you might have missed on your final wet sand. And if you follow the directions for mixing k-36 as a sealer, it will be much thinner than k-36 used as a primer/surfacer. Going on thin, it will go on wet with very little orange peel so your color coat can go on while it's still wet (let it flash off)
I use a regular paint gun for this, as primer gun has too big of a tip for the thinned down version. (use a 1.4 or 1.6 tip)

The only negative: You are going around the car with the gun that much more for your final product... If you are painting in a less than perfect booth, you have that much more chance of getting bugs or trash in your paint job
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Old 05-24-2005, 10:02 AM
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Did your paint rep recomend DBC with the Global 894 clear?
- No. The sales person recommended Stratoclear?!?!. I went with the 894 on the advice of several people on this discussion board. I also talked to a Global PPG rep and they said the 894 would be no problem over the DBC.

UPDATE: I shot the quarters, doors, and hood/trunk backs this weekend and it came out very nice! The 894 shot smooth as silk and I haven't got any runs (couple of dust nibs but those should clean right up). I can't believe how sweet that Sata RP sprays! Best money I ever spent. My Devillbiss has been bumped to primer duty.
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Old 05-24-2005, 12:30 PM
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cant go wrong with the sealer, not only it provides proper tint for base but also seals off bodywork/anywhere you sanded through in primer
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Old 05-25-2005, 02:21 PM
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I agree, the 894 is some awesome clear. I see global clears and primers being used with DBC color alot, DBC is easy to spray compared to many of the Global colors.
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