Poobah Posted August 29, 2007 Report Share Posted August 29, 2007 On a hobby project, I've filled some small dings and rust pits with Bondo. After priming with Rustoleum primer, I can see some minor imperfections in the surface. Can I apply Bondo Glazing & Spot Putty over the primer, or should I sand back down to the bare metal (and Bondo) before applying the putty? Does anyone have experience with this? Thanks in advance. Happiness is owning a Cadillac with no codes. Link to comment Share on other sites More sharing options...
JIMDTS Posted August 29, 2007 Report Share Posted August 29, 2007 Glazing it over with spot putty will work However you are better off just sanding it back down to the bondo & fill the pits with bondo the problem with spot putty it’s much softer than bondo. Careful with primers I don’t know what you are work’n on these newer paints today are all paint systems you have to use the rite primer or it’s not compatible with the paint Normally you use the spot putty over the primer to fill pits & imperfections in the bondo.. Jim Link to comment Share on other sites More sharing options...
Poobah Posted August 29, 2007 Author Report Share Posted August 29, 2007 Normally you use the spot putty over the primer to fill pits & imperfections in the bondo.. I'm building the fat-tire cruiser bike I could never afford as a teenager. I have a pre '48 Schwinn Phantom frame that had the paint stripped off. There is some rust pitting and small dings I'm trying to fill before I paint it. I am using spray cans of Rustoleum primer and Rustoleum gloss black paint. I've filled the pits with Bondo and sanded them smooth. The problem is there are some imperfections that showed up after I primed it. It's hard to see what's going on when when you're looking at bare steel and Bondo because they are different colors and reflect light differently. I'd like to putty them on top of the primer, re-sand them, and re-prime them until I get it right. I just don't want to go to all that work if the putty is going to flake off and ruin the job. Happiness is owning a Cadillac with no codes. Link to comment Share on other sites More sharing options...
zonie77 Posted August 30, 2007 Report Share Posted August 30, 2007 Spot and glazing putties shrink more than bondo. Sand and bondo. they continue to shrink even when you think they are dry. Bondo does this too but to a lesser extent. If you use the spot putty you may have little dips show up weeks or months after you paint it. What paint are you planning to use for the color? Make sure the primer is compatible. It's best to stick to one brand for all the paint. Link to comment Share on other sites More sharing options...
Poobah Posted August 30, 2007 Author Report Share Posted August 30, 2007 What paint are you planning to use for the color? Make sure the primer is compatible. It's best to stick to one brand for all the paint. Rustoleum in spray cans, Primer and Gloss Black. Happiness is owning a Cadillac with no codes. Link to comment Share on other sites More sharing options...
Patrick7997 Posted September 5, 2007 Report Share Posted September 5, 2007 Glazing Putty is for fine scratches, sanding marks, stuff like that... can be sanded ultra smooth.... If you have actual gaps or depressions, you need to bondo those. Glazing putty is for over the bondo, for the final superfine coat over light scratches and sanding marks... it fills only the smallest gaps & imperfections. Everybody does it different, but in general, if your first primer coat reveals MINOR scratches, you can sand, glazing putty, sand to perfection, prime again.... Link to comment Share on other sites More sharing options...
Poobah Posted September 6, 2007 Author Report Share Posted September 6, 2007 if your first primer coat reveals MINOR scratches, you can sand, glazing putty, sand to perfection, prime again.... Thanks, Patrick, that's what I wanted to know. Happiness is owning a Cadillac with no codes. Link to comment Share on other sites More sharing options...
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