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Old 02-18-2011, 09:44 AM   #1
jalopyshots
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Default Bondo and Paint

What am I doing wrong? Every time I bondo something then paint it, the bondo looks dull.

Am I not sanding the bondo with fine enough sand paper? I used 220 on the tank below.

Not waiting long enough before painting the bondo? How long should I wait?

The paint looks good on the bare metal for rattle can paint job. Just looks bad on the bondo.

Thanks

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Old 02-18-2011, 09:47 AM   #2
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Default Re: Bondo and Paint

you gotta use a sealer primer. are you painting right over the bondo?
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Old 02-18-2011, 09:51 AM   #3
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Default Re: Bondo and Paint

Quote:
Originally Posted by laid55 View Post
you gotta use a sealer primer. are you painting right over the bondo?
Yep, sure did. What about etching primer? What is that?
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Old 02-18-2011, 10:07 AM   #4
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Default Re: Bondo and Paint

Etching primer is usually for bare metal. Get some high fill sandable primer to go over the whole tank after it's bondo'd. Sand, wet sand, get it slick and lay some color. Ofcourse you have to prep it in between steps but thats the general idea
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Old 02-18-2011, 11:28 AM   #5
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Default Re: Bondo and Paint

yeah, put lots of primer on like six ball said, like 3 coats or something, then you can sand it smooth in a few gradient grits. Then even put more primer on and sand again, then you can put down colour.
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Old 02-18-2011, 11:33 AM   #6
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Default Re: Bondo and Paint

You can also spray a very very light guide coat of black after prime to help with the sanding process,it will help you see how many scratches are left to sand out. If you cut through the primer re-shoot and sand again. thats all i got.
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Old 02-18-2011, 12:10 PM   #7
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Default Re: Bondo and Paint

what the other guys said. even w/ a rattle can you still need a good coat of primer. what they left out(maybe because it's kinda obvious) is to buy the same brand of primer & paint. if the 2 aint compatable it'll give ya crappy results.
bodywork, clean, primer, guide coat, sand, clean, base(color),clear and done.
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Old 02-18-2011, 12:17 PM   #8
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Default Re: Bondo and Paint

Spray can primer is junk. Get a cheap gun and get away from the rattles.
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Old 02-18-2011, 03:31 PM   #9
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Default Re: Bondo and Paint

Think of primer as the final coat of filler with the added benefit of sealing the pores in the bondo. If you sand through the primer, you expose the absorbent bondo.
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Old 02-18-2011, 03:45 PM   #10
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Default Re: Bondo and Paint

You're going to want higher than 220 grit as well.
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Old 02-18-2011, 04:27 PM   #11
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Default Re: Bondo and Paint

Missed that!

Wet sand! Start off with 400 grit to knock the tops off, switch 600 until the sand scratches show around the edges, give it a few licks with 1000 and paint it. Guide coat will help you find low areas and pin holes.
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Old 02-18-2011, 04:29 PM   #12
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Default Re: Bondo and Paint

IMO 220 grit should be fine for shaping the filler. Then block the primed surface with wet 320 or finer wrapped around a sanding sponge. You can also use a product called glaze or spot putty over the sanded filler before primer is applied. The glaze covers minor pits and pin holes in the filler. The glaze should also be lightly sanded before primer is applied. Good luck with your project.
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Old 02-18-2011, 05:09 PM   #13
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Default Re: Bondo and Paint

Having the proper sanding tools will help you a lot. I had been using a chunk of closed cell foam, like upholstery stuff.

A buddy picked me up one of the 2.5x5 rubber sanding blocks. The was so much better than what I was using I ended up getting some of the durofoam blocks, which are also great for big projects.

So if you have any plans of doing this more than once. Get the small sanding block and buy some small rolls of adhesive backed sand paper in a few grits. After you do you won't know how you got along without them.
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Old 02-21-2011, 09:40 PM   #14
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Default Re: Bondo and Paint

Thanks guys. I always rush. I need to slow down.
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Old 02-21-2011, 09:47 PM   #15
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Default Re: Bondo and Paint

Just remember this, The better the prep the better the paint job. It's all about the prep job.
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Old 02-22-2011, 01:58 AM   #16
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Default Re: Bondo and Paint

1) .finish sanding the bondo with 320 grit sand paper, blow off the part with air to get all dust off. wipe clean with "wax and grease remover"(or acetone) but DO NOT wipe the bondo with it just the bare metal.wear gloves when touching anything to be painted any grease or oils from ur skin can mess things up.

2) since ur using rattle cans, get some "Primer surfacer" or "sandable primer" and spray about 3 good coats letting it dry or tack up between coats about 10-15min. then give it about 30-60min to dry completly depending on how heavy you sprayed it.

3) buy "wet sanding paper" 600grit and sand all primer till you dont feel any bumpy or rough areas, stay away from edges as you can sand right thru the primer very easy and paint does NOT stick to bare metal too good.

4) if you do sand thru and expose any metal buying some "sealer primer" in a can will remedy the problem and spray about 2 nice wet coats right over the old primer. and you dont have to worry about sanding this one just spray the paint right over the sealer.

5) spray color, about 3 good coats or until all primer is completly covered

and remember to blow off the panels before spraying to get any lint, dust or dirt that may have landed on it.
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Old 02-22-2011, 06:20 AM   #17
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Default Re: Bondo and Paint

www.colorrite.com

Has all you spaycan needs and spray can clears to.
and for you guy that need to match factory colors they have that to.
I also put my spray bombs ina bucket of hoy water for 15 mins before I use em it lays the paint out nicer.....hope this helps ya out a bit..
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Old 02-22-2011, 07:14 AM   #18
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Default Re: Bondo and Paint

I agree with all the advice given EXCEPT the "stay away from spray bombs" advice. For us "low budget" blokes...it is the only way to go. Here are some pics of my scoot I painted this winter. ALL SPRAY BOMBS! And, yes, there is a little bondo on a tank corner and filling a few holes that were in the fender. All I have left to do to it is hit with some 1000 grit and cover with 2k (two-part) clear outta the spray can for fuel resistance. This was my first painting attempt and I have fallen in love with the spray bombs. All shot with Duplicolor cans.
Take your time and hang in there....listen to the advice given...you will get it.
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Old 02-22-2011, 08:21 AM   #19
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Default Re: Bondo and Paint

^^^^^^^ that looks great. It really matters whats on the first coat ( adhesion) and waht is on the finish. If it doesnt stick to the bare surface it doesnt matter what you use it will come off easy . Then the real urethane clear on top. Whats in between isnt crucial.
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Old 02-22-2011, 08:41 AM   #20
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Default Re: Bondo and Paint

Colorrite had clear and activator in spray bombs Regular urethane clear.gas resistant...flip can over and push button activate the clear shake it up and spray.Once activated it has a pot life of about 4hrs...

But no doubt nothing beats spray gun painting.Urethanes
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