Stupid_fast Posted July 26, 2010 Report Share Posted July 26, 2010 Hello, I'm sanding the paint off my fender to paint it and theres lots of small rust spots. If I just sand the majority of the rust off of it, is it OK to paint over the rest, or is there a good reason not do do that? The paint is rattle-can rustoleum primer. They are only very small black-ish spots at this point. Also for the inside of it I'm going to get undercoating for and was wondering the same thing for that. Can get pics when I get home. Quote Link to comment
Laecaon Posted July 26, 2010 Report Share Posted July 26, 2010 I would sand a good inch or two around each rust spot to bare metal. Quote Link to comment
Stupid_fast Posted July 26, 2010 Author Report Share Posted July 26, 2010 I've done more since this pic, but here is what i'm doing. The rust spots I'm talking about are about 5-10mm big, and take a long time to sand out. Quote Link to comment
Laecaon Posted July 26, 2010 Report Share Posted July 26, 2010 That looks alot like my car used to! Well definitely get out as much as possible unless it goes all the way through then it might be worth keeping the rust for awhile... I would put some sort of rust inhibitor to stop the rust, then prime, but thats just me. Quote Link to comment
Stupid_fast Posted July 27, 2010 Author Report Share Posted July 27, 2010 That looks alot like my car used to! Well definitely get out as much as possible unless it goes all the way through then it might be worth keeping the rust for awhile... I would put some sort of rust inhibitor to stop the rust, then prime, but thats just me. Rust inhibitor? Please explain. :P Will do, thanks. Quote Link to comment
Guest DatsuNoob Posted July 27, 2010 Report Share Posted July 27, 2010 Get some Phosphoric acid etch/prep. You can get the stuff at most any hardware store for around $15 a gallon. This stuff does 2 things, neutralizes rust (really just slows it down alot, you never get rid of it unless you cut that stuff out) and etches the metal so paint will stick better. I use POR-15 Marine Clean for all degreasing/final cleaning before painting, stuff works great! I'm sure there are other products out there that work just as well, but it's what I've had good luck with. There's really no short cuts on body work if you want it to look good, you gotta put in the time. Are you on a tight budget? If so rustoleum is an option, POR-15 or other rust encapsulating paints are ideal (there are many that do the same thing). Once you got that rust encapsulator on, you can lay your filler right on top of it while it's just barely tacky. Fillers have etching agents in them that will bond to the paint/primer, and you still have your metal treated/sealed underneath. If you go the POR route or use a similar product, a tie coat primer will be needed to bond your top coat. Tie coats are nice too because alot of them are high build. Gives you a chance to tune the panels right before paint. Quote Link to comment
INDY510 Posted July 27, 2010 Report Share Posted July 27, 2010 The rust spots I'm talking about are about 5-10mm big If you can't get to clean bare metal........... it will just rust under the paint...... ... and then crack your paint or bondo Are you trying for perfect paint?........ or just a rattle can job? .............. either way..... prep work is everything,,,, and starting with bare metal will insure a long lasting paint job........ where painting over those rust spots will only last a few months... Rust inhibitors are okay.......... but the metal will continue to rot until you grind/cut out all the rust You can find this at any Hardware store: Quote Link to comment
Guest DatsuNoob Posted July 27, 2010 Report Share Posted July 27, 2010 "that is what I just said..." Quote Link to comment
skunk Posted July 27, 2010 Report Share Posted July 27, 2010 dont lisson to that ass hat datsunoob, this is what you want to do. Get some Phosphoric acid etch/prep. You can get the stuff at most any hardware store for around $15 a gallon. This stuff does 2 things, neutralizes rust (really just slows it down alot, you never get rid of it unless you cut that stuff out) and etches the metal so paint will stick better. I use POR-15 Marine Clean for all degreasing/final cleaning before painting, stuff works great! I'm sure there are other products out there that work just as well, but it's what I've had good luck with. There's really no short cuts on body work if you want it to look good, you gotta put in the time. Are you on a tight budget? If so rustoleum is an option, POR-15 or other rust encapsulating paints are ideal (there are many that do the same thing). Once you got that rust encapsulator on, you can lay your filler right on top of it while it's just barely tacky. Fillers have etching agents in them that will bond to the paint/primer, and you still have your metal treated/sealed underneath. If you go the POR route or use a similar product, a tie coat primer will be needed to bond your top coat. Tie coats are nice too because alot of them are high build. Gives you a chance to tune the panels right before paint. :lol: Quote Link to comment
INDY510 Posted July 27, 2010 Report Share Posted July 27, 2010 That's kinda what I was trying to say,,, , except I think the best thing you could do is get some Phosphoric acid etch/prep. You can get the stuff at most any hardware store for around $15 a gallon. This stuff does 2 things, neutralizes rust (really just slows it down alot, you never get rid of it unless you cut that stuff out) and etches the metal so paint will stick better. I use POR-15 Marine Clean for all degreasing/final cleaning before painting, stuff works great! I'm sure there are other products out there that work just as well, but it's what I've had good luck with. There's really no short cuts on body work if you want it to look good, you gotta put in the time. Are you on a tight budget? If so rustoleum is an option, POR-15 or other rust encapsulating paints are ideal (there are many that do the same thing). Once you got that rust encapsulator on, you can lay your filler right on top of it while it's just barely tacky. Fillers have etching agents in them that will bond to the paint/primer, and you still have your metal treated/sealed underneath. If you go the POR route or use a similar product, a tie coat primer will be needed to bond your top coat. Tie coats are nice too because alot of them are high build. Gives you a chance to tune the panels right before paint Quote Link to comment
Stupid_fast Posted July 27, 2010 Author Report Share Posted July 27, 2010 Are you sure? I was going to get some Phosphoric acid etch/prep. You can get the stuff at most any hardware store for around $15 a gallon. This stuff does 2 things, neutralizes rust (really just slows it down alot, you never get rid of it unless you cut that stuff out) and etches the metal so paint will stick better. I use POR-15 Marine Clean for all degreasing/final cleaning before painting, stuff works great! I'm sure there are other products out there that work just as well, but it's what I've had good luck with. There's really no short cuts on body work if you want it to look good, you gotta put in the time. Are you on a tight budget? If so rustoleum is an option, POR-15 or other rust encapsulating paints are ideal (there are many that do the same thing). Once you got that rust encapsulator on, you can lay your filler right on top of it while it's just barely tacky. Fillers have etching agents in them that will bond to the paint/primer, and you still have your metal treated/sealed underneath. If you go the POR route or use a similar product, a tie coat primer will be needed to bond your top coat. Tie coats are nice too because alot of them are high build. Gives you a chance to tune the panels right before paint. <img src="http://community.ratsun.net/public/style_emoticons/default/biggrin.gif" alt=":D" class="bbc_emoticon"> Quote Link to comment
Stupid_fast Posted July 27, 2010 Author Report Share Posted July 27, 2010 Damnit, it double posted. Quote Link to comment
hang_510 Posted July 27, 2010 Report Share Posted July 27, 2010 this has been said like 5 times... :rolleyes: http://community.ratsun.net/topic/23351-paintingpriming/page__pid__330531#entry330531 Quote Link to comment
Guest DatsuNoob Posted July 28, 2010 Report Share Posted July 28, 2010 I hate all of you :mellow: Quote Link to comment
Stupid_fast Posted July 28, 2010 Author Report Share Posted July 28, 2010 Lol, its just a joke. Thanks for the help.:P Edit, Also are there any bad brands of filler that I should watch out for? Quote Link to comment
Guest DatsuNoob Posted July 29, 2010 Report Share Posted July 29, 2010 Yeah, Bondo. Dont get that shit anywhere near a Datsun. Good enough for a Honda though. UPOL is good shit Everyone knows how much I loave UPOL products Ho-Ray! Quote Link to comment
Laecaon Posted July 29, 2010 Report Share Posted July 29, 2010 Its body filler? Yea it sucks to have bondo on a car, but its better than having non smooth panels. I dont mean to fill in massive crumples, but to use after messaging the panel into the best shape you can get it to, then bondo it. Quote Link to comment
Guest DatsuNoob Posted July 29, 2010 Report Share Posted July 29, 2010 NO! I was talking brands. Bondo brand filler is :poop:, get some quality filler from an auto body supply shop. Quote Link to comment
INDY510 Posted July 29, 2010 Report Share Posted July 29, 2010 You should try UPOL instead of Bondo.... Shit sticks like no other........... they used that shit to paint tuna cans in the 60's... .. .. .... fuckers still aint rusting 1 Quote Link to comment
Guest DatsuNoob Posted July 29, 2010 Report Share Posted July 29, 2010 True story Quote Link to comment
Stupid_fast Posted August 7, 2010 Author Report Share Posted August 7, 2010 I finally got around to uploading a picture. This is the rust I was talking about. Should I try to sand it down more? I guess just as much as I can? 1 Quote Link to comment
Guest DatsuNoob Posted August 7, 2010 Report Share Posted August 7, 2010 Go get the acid! You mix it up a little strong and that shiz scrubs right off after letting it soak in for a while. 15 bones! DO IT Quote Link to comment
Stupid_fast Posted August 7, 2010 Author Report Share Posted August 7, 2010 Go get the acid! You mix it up a little strong and that shiz scrubs right off after letting it soak in for a while. 15 bones! DO IT OH I think I have some of that stuff around here somewhere... Quote Link to comment
Guest DatsuNoob Posted August 8, 2010 Report Share Posted August 8, 2010 Get after it! You only have one panel to do, I have about 8. Stuff works well, and doesnt cost much. Quote Link to comment
Stupid_fast Posted August 8, 2010 Author Report Share Posted August 8, 2010 Get after it! You only have one panel to do, I have about 8. Stuff works well, and doesnt cost much. ...My hood is red. But yes, I have been working on it... Hope to finish the sanding today. Then start on the rust removal, then onto buying some body filler. Quote Link to comment
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