Priming Bondo. Cabinet Painting Tips.

this christy idaho painter here on paint live tv today i'm going to be answering a question about the bondo so i'm working in this 1950s renovation we're doing a lot of sanding doing a lot of spackling and doing a lot of bondoing and the red stuff on the doors right here is bondo glazing putty and that's what we put on after spackle and sand that because it's harder than spackle it sands flatter and it gets rid of small imperfections that sparkle will not get rid of because it's too soft and it'll stand out so we use bondo now the bondo glazing putty is red i've heard there's other colors of it out there where i come from there is no other color options other than red and red shows up um when you use your top coat you know pretty easily so uh people are asking me do you prime the bondo before you spray in your top coat now typically we don't prime our bondo before spraying the top coat and because we always spray two coats and we're using really high-end top coats that cover extremely well even when they're white and so usually you're gonna see the bondo you know fairly easily after your first coat but after our second coat you usually never see the bondo anymore if you do a third go you're definitely not going to see the bondo so if you're trying to one coat it you probably should prime it because that's going to cover white primer is going to cover that red and then you're going to go over with your top coat and it's going to up cover in one coat but we're always doing two coats but even with some of the products out there we were just spraying some benjamin more advance two coats and i can still see the bondo in some cases because i had to spray it on really thin because it was cool and the product was running a little bit so you can prime it so you don't need to prime it because your top coat's going to bond to your bondo without a primer but the primer serves a purpose making it so your top coat hides better especially if you're doing white i do if i'm going to do any spot priming we've been spot priming here we're just going to be using a product bin this is bin shellac based primer right here it dries super fast and it covers super well and so we can top coat it extremely quick so it's just going to make it so it covers a little bit better so you can see i'm going to spray my it's just going to be a very light coat the shellac primer right here the bin it runs really easy so you want to stand back quite a bit when you're actually spraying that primer that's all i need to do if i was trying to one coat this now i could spray that one coat one super heavy coat if it's laying down especially and it's gonna cover it but once again we're typically two coats no we don't typically prime our bond our bondo but you can if you're concerned about coverage i know there are some um in the past i've used some really inexpensive inexpensive uh top coats like trim paints and stuff and you know they're just a lot of fillers don't have a lot of titanium in them and resins in them and they don't cover very well and this would be a case when you would really want to spot prime it otherwise you may have to three coat over your bondo so you can see i'm back pretty far just lightly hitting this to get it to cover now that's primed right there ready to go got some bondo we shot up here if you get any closer than 12 inches to your surface when you're spraying this primer you're going to get runs it dries extremely fast but runs really easily so it's just short burst when you're doing your spot priming there are some parts on this door right here that we sanded down through multiple layers of paint you can even spot prime that if you're actually doing spot priming and that will cover a lot better right there just like that we did sand this door i used my ekasan 3x4 sander right here used 320 film tech to sand all the flat surfaces the contours profiled i'm using medium eka silk right here just sand all my contours right there i'm going to continue sanding right along right here and and spot priming if i need to we're going to be using a product spray in these doors from centurion coatings we're using their 400 series interior trim product and it absolutely covers amazing it does cover right over the bondo in one coat we're going to be two coating it it'll be covered 100 percent and two coats but once again um do you need to prime over your bondo no but if you're concerned about coverage then you'll want to spot prime it it's very simple easy to do do you need to sand after you spray that spot primer we spray the prop spot primer on and when i use the zinzer bin primer right here we never have to sand prior to doing our top coat this stuff lays out gels out absolutely fine if you do get some runs in it you'll have to sand out those runs so here's a look at the bondo glazing and spot putty we use just like this and i'm not in the automobile industry but it's my understanding that when you got large dents you put bondo over it sand that then you use bondo glazing putty to go over the top of that um if i'm wrong you can correct me but that's what's my theory is or what i've heard bondo glazing putty is it's widely used in uh the painting industry around here uh fixing nicks dings new construction all homes new construction they'll put spackle in all the nail holes sand that then you'll go over it with bondo glazing putty and you'll never ever see where that nail was before um before it was put there so this is it and i'm just got a few things i've got to bond on here and it's just swiped on with a knife goes on red dries extremely fast it's good for filling small things not good for filling large holes because it shrinks too much but great for getting rid of all these imperfections you can even get rid of brush strokes and stipple mark stipple marks by using bondo glazing putty but these little tiny nicks and dings you could never get rid of those with sparkle your sander would or sandpaper would sand those right out there's a spot right here where there was a latch and you'll see when i scrape it the dark areas what's left behind is where that latch was so when it comes to bondoing or actually priming over your bondo so the primer really is just for coverage issues so if you're losing low end top coats that don't cover very well that's really what spot priming over your bondo does it has nothing to do with adhesion i don't prime because adhesion the top coats we use adhere perfectly fine to the bondo so it's not for adhesion purposes it's just for coverage purposes when we're spot priming with bin bomb cans so there you have it a simple tip using bondo glazing putty if you've got any questions about this the primer that we're using the bin the bondo glazing penny the sanding process just let us know if you've got any tips and tricks if you do it a different way let us know down in the comment section below we would appreciate hearing your comments we learn from you just like you 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