Does bulldog adhesion promoter need a primer? - Hot Rod Forum : Hotrodders Bulletin Board
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Old 01-13-2006, 09:18 PM
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Does bulldog adhesion promoter need a primer?

I went to the local paint shop today and asked for a primer I could use on my new urethane body kit. I was given a can of Bulldog adhesion promoter. Once I got home and read a few posts, it looks as though most people will use the adhesion promoter and then spray a primer. Is this needed? Should I go back to the store tomorrow and buy a flexible primer or would just a sandable duplicolor primer be fine?

Also, from the looks of the back of the can this can be sprayed on a smooth surface. Is this correct that the panels to not need to be sanded?
Thanks.

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Last edited by SplitFire; 01-13-2006 at 09:26 PM. Reason: Needed to add another question
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Old 01-13-2006, 09:49 PM
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Paint can go right on top of Bulldog ..

You do need to scuff the new panels with 400 or a red scotchbright pad ..

Last edited by milo; 01-13-2006 at 09:57 PM.
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Old 01-13-2006, 09:57 PM
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If the kit really is urethane and not some other plastic like TPO, an adhesion promoter is probably not necessary. Plastic parts do require more careful prepping to ensure good results.

First make sure that any product you use is compatible with the topcoat you will be using, Paint manufacturers have their own adhesion promoters they want you to use. If the parts are smooth and defect free, all you should need to do is prep them and apply the proper sealer before paint. Since I use PPG I would shoot a coat of K36 mixed as a sealer before painting.

I would definitely abrade the surface before anything gets applied. For bare plastic first use a prep solvent designed for plastic. Then I use gray scuff pads and a prep paste that has some strong cleaners and a very mild abrasive. This is like a wet sanding process that will remove any remaining mold release and contamination. After the parts are dried the prep solvent is used once more just before spraying. It's a bit involved, but these steps help insure that the paint will stick.
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Old 01-13-2006, 10:40 PM
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Is this a bare urethane piece. The way I prep these is to wash with soap and water and clean with a wax and grease remover, although like crash said they make cleaners specifically for plastic. Then I will sand the part well with around 400 wet and spray on adhesion promotor and a coat or two of urethane 2k primer. Then sand that with the final grit recommended for the paint you are using, checking over before painting. Urethane primers and clear have some flex, so no need really to use a flexable primer or flex additive in the clear if you use urethane products that are the norm today. Lacquer primers I believe are less flexable and I guess you would be better off buying a flexable primer in that case. I have never used a flexable primer, as I haven't had any problems with urethane primers on those type of parts, and a 2k product is going to be best to use IMO. You don't really have to prime over adhesion promotor, but I do. If this is already painted then just sand it and prep as any other part. I still like to spray adhesion promotor on any spots that you go down to bare urethane, like if you have a deep scratch or something you are sanding out.

Last edited by kenseth17; 01-14-2006 at 02:45 PM.
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Old 01-14-2006, 05:43 AM
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A body kit is going to move and have lots of road debree hitting it all the time... Scuff the kit, spray 2 light coats of bulldog, then set it in epoxy... come back the next day and either sand it or shoot 2k over it and go to work... then you can block it down and spray base/clear
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Old 01-14-2006, 08:15 AM
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Thank you very much for all the replies. The parts are currently sanded with 600 grit. Should I go back over it with 400 before spraying the bulldog?

Thanks again everyone.
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Old 01-14-2006, 10:42 AM
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I personally like lower grits for better bites... however when I prep new bumpers etc.. I use a grey scotchbrite and scuff it gel then bulldog and epoxy...
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Old 01-14-2006, 02:43 PM
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600 should be fine.
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