Laquer based primer

[Envious Interiors]

hey, i was wondering if I used a laquer based primer over bondo areas, or possible a whole vehicle, would it cause problems with a urethane base/clear paint?

im trying to speed up the prep process because im running a 1 man show, and i need to get jobs in and out quicker, so less primer dry times, means i can sand the primer sooner and be ready for paint faster. the primer is also cheaper, so, thats another plus.

if i have a car that comes in, with minor body work, and i fix the areas, and sand the rest of the vehicle with a 320 grit, do i need to seal the vehicle, or can i just clean the surface and base/clear over it. thanks for the advice

 

[little john]

sealer always is the best bet for eliminating any dieback or lifting problems from the bodywork or prior paint repairs .Better safe than sorry.

 

[Envious Interiors]

so, can i use the laquer based to fill scratches in bondo, so i can get them sanded quicker, and then apply a sealer?

 

[ezrider]

Primer is the foundation for a quality paint job, custom or stock. Laquer primers shrink and you will have to spray more coats to equal urathane primer. laquer adhesion properties are not the most reliable either. saving a couple bucks now will probily hurt you in the long run using laquer primer

 

[tcannon]

I've used the following last year on a couple of cages. Using Dupont Nason products, I used their 491-17 Etch primer on the bare metal then their 421-08 gray acrylic primer surfacer then their 422-23 sealer. The 421-08 is called an acrylic type primer and you thin it with lacquer thinner. The jobber doesn't refer to it as lacquer primer but it shoots and dries like the old 30-s (I think that's the number) Dupont lacquer primer. I shot urethane bc/cc over this and they turned out great. A year later (outside) they still look the same. Next year, who knows? These were budget jobs that look as good as the high price spread! I did like the Nason sealer. It comes ready to spray, covers/fills good and dried fast. Good luck, TC.

 

[rex]

I agree with EZ.You have to remember too that most people use too fast a thinner in primer,hence alot of the killer shrinkage.If you actually use the proper thinner the dry time will be longer than urethane.If I'm working with lacquer my primer is cut with a color grade thinner and each coat gets a day to dry-3 coats 3 days.Since it's inherently thinner in applied solids you also need to finish your bodywork off much finer and you can't rely on it to fill in the lows or thick featheredges as well without shrinking in later.There's also special requirements in sealers and their use to put urethane over lacquer primers.Stay with a good primer.PPG's NCP255 can be sanded in about an hour if the right reducer is used and it isn't hosed on but don't use it,it's notorious for shrinkage,most should dry overnight.I will say Rubber Seal makes some great primer for about a C note but you have to wait overnight too to dry and it sands a touch hard.When it kicks off it's locked in though,36 grit scratches won't shrink in.The ideal thing to do for turnaround time is plan out priming one and straighten and prime another while the first is drying.Of course if you can only work on one at a time you're screwed.

 

[Envious Interiors]

so, i should stick with the 2k urethane primer surfacer. i used the martin senour brand urethane surfacer, and after like 5 hours in 65-70 degree temp, i attempted to sand it, and it clogged up on the paper. why is this? i let it dry over night, and it did the same thing. and a 600 grit, wet, just slid right over it and didnt do a damn thing. i cant think of what i did wrong or how to prevent it in the future. i wanted to sand over the bondo area that i sprayed and i couldnt.

 

[Duleyman]

I put accelerator in my 2k primer and then apply my heat lamps, 1 hour later I'm sanding and have not had a problem with shrinkidge. Sands great and doesnt clog sand paper. I use this method on fully painted motor coaches at my shop that range from 125k up to 1 mill. and have never had a problem.

 

[Envious Interiors]

this accelerator? aka as hardener? or can i buy accelerator from the paint store? I have 4 of the 500 watt halogen flood lights in my makeshift booth, as well as a few of the halogen tube lights. they keep it somewhat warm in there. do you think they would work well as heat lamps? or is there something else i need to buy i guess when i shoot this next vehicle with the primer, i will see how well it does. i primed a small area on a bed of a truck where there was bondo, and i never was able to sand it. i lightly sanded it with a 600 wet, and then sealed over it. i might try and call and see what they have for an accelerator. thanks for the help.

 

[Duleyman]

accelerator is a product that I add to my catalyst, I use the Rocket product which can be used with any catalyized paint, primer, clear coat etc. it speeds up the drying process ten fold if properly mixed. I only use it in my 2k primer- sealers, I dont like what it does to the clear coats, to much dye back and looses it smooth glossy look.

 

[Envious Interiors]

do you know if i would be able to pick some of that up at NAPA? thats where i go for all of my paint supplies. I would only use it on primers and sealers, paint and clear coats i let dry on their own. thanks for the help

 

[Envious Interiors]

amazingly enough, NAPA has that accelerator stuff. i will get to try it out tomorrow on the primer surfacer, then i will sand that and spray the sealer onto the rest of the truck cab. thanks for the help

 

[rex]

If it's gumming up the paper it's still uncured.Accelerators in general will push the flash and sand times up faster but they won't necessarily cut down on the real cure time.I think I'd research a primer that will cure out faster,but not so fast it compromises reliability.Most primers are good to sand the next day unless the temp dips below 60 or 65 degrees where the chemical reaction of the hardner gets slowed way down.The colder it gets the longer it takes the reaction to happen.

 

[Envious Interiors]

so, if i use the accelerator, and stick a box heater next to it, about how long do you think it will take before i can sand it?