May 28, 2007. I think its a waste of time to wet sand primer/epoxy. Dry Sanding Primer is sometimes better then wet sanding but we'll let you be the judge wh. DA or sand the Ospho again, when dry or after a day or so, with 80 grit, wipe it clean with paint manufacturers recommended cleaner and degreaser and spray with 2 part epoxy. Now it's finally time for paint. Being you sanded with 120 grit you are going to need more material to fill the 120 scratches. Just breathe on that really gently with some superfine steel wool and you should be ready to apply color. I have bare metal and two spots where the old primer came through. True Value Company). because applying multiple layers of . If you don't smooth and level it out with sandpaper you can't expect the finish to be smooth and level. x711. Option 2 is to use a POLE SANDER. This leads to peeling, flaking, and eventually rust, which turns a driveable car to junk in no time. Wipe the surface with a tack cloth to remove the dust. Scuff sand all recessed areas and panel edges with a general-purpose scuff pad or equivalent. Step 3: Let your Car Dry. 5. Step 4. Dry sanding 2k primer surfacer with a d a sander. To restore lightly rusted metal surfaces to their original state, use a brush to clean off loose rust, sand the area, and apply a high-quality rust-inhibitive primer (e.g. If metal surface is badly pitted or rusted, the rust must be removed. Avoiding sanding after applying primer is one the biggest mistake most people make. It's also a good primer for brand new metal. While block sanding the car, I sanded through at a few spots. i like to put 3 coats of 2k on then block with 180 dry, it cuts much flatter. First and foremost, automotive primer helps the paint adhere to bare metal. When sanding metal with an orbital machine, always start with a coarse sanding disk. Epoxy primer seals out the oxygen from the metal along with moisture, chemicals and UV rays. Wipe it down really good with a clean rag and give it a couple of hours to dry and give it a very thin coat of primer. For this you need some rough sanding paper (100 - 200 grit) and a sanding block. This can take a few hours after washing the car, but it really will depend on the weather. Most, if not all, of the primer surfacer will get sanded off as the body is block sanded. A primer or epoxy primer creates a superior surface for the paint to stick well to the bare metal and promotes a quality finish. The heavier grit will cut the surface level rather than follow the contour of the high and low spots. Rust-Oleum Rust Reformer). How Long To Wait Before Sanding After Primer or Undercoat? For Rough Surface Finish. So you don't need metal etching primer. Use a 50% mix of water and rubbing alcohol. Finally, use a paintbrush or roller to paint the wood with the desired paint color. Car paint primer acts as a bonding agent to help the paint . However, always remember to be careful and sand slowly to avoid eating into the surface and weakening the material. If you want a beautiful finish, you should always sand over primer. An average sized room takes 10 - 15 minutes. For latex primers, it takes about 30-60 minutes to dry to touch. So by lightly sanding it, you'll create a fine surface where paint grabs hold. Prime the walls and sand them lightly after the primer dries to remove paper fuzz and lumps. Still, sanding primer ensures that you utilize fewer coats of paint. I them used a 2k epoxy primer and then a couple of coats of 2k urethane high build primer. Sand, sand, sand till you'll see the original primer and have a nice and smooth surface. Posted: Wed Apr 13, 2016 6:13 pm Post subject: Re: Sanding after primer coat? 80 grit for the bare metal and 180 (or smoother) for areas that are not bare (filler, prior paint, or prior primer). . Ospho IS the etching agent. We have already made that very clear. For large, flat surfaces, use a sanding block to get even pressure. Allow it to dry thoroughly for at least an hour. But since you are using this method a couple of pointers. However, you must not paint the surface until the primer dries thoroughly, which can extend up to 3 hours. after you block it then repair any spots that need repair. Paint will adhere much better to a surface with primer than to a car that hasn't been primed. Start with a heavy-grit sand paper, such as 220 grit. let that dry and then one more thin coat of primer. Start with 120-grit sandpaper and work to finer grade sandpapers, ending with 320-grit. A resin or shellac primer suits wood, plaster, metal, and plastic. This article highlights sanding after priming in greater depth. So roll up your sleeves, find a good position and start sanding with the lowest grit, moving up to the 200 grit and sanding block. Use a standard hair dryer to dry the surface. No matter which primer you choose, . Recommended videos. Whatever stayed on car that was solid. I typically wet sand my final coat of primer with 600 and then 1000 grit before applying the color coats. Sounds to me like you DO sand with two different techniques. In addition, cool temperatures and high humidity prolong the . Next, use a primer to paint the wood. Sanding inside corners with a hand sander is asking for trouble. Spray the paper itself, then start gently sanding the body of the vehicle. Sanding primer smoothens the surface and creates the ideal environment for the paint to adhere to. Also, between primer and paint applications, you should wet sand the vehicle with a 1000 - 1200 grit piece of sandpaper.Jan 27, 2012 Do you have to sand before using Kilz primer ? You should wait for a primer or undercoat to be completely dry before sanding. then mix a small amount of primer and just spot prim the repair areas, and reblock untill their good. The thing is, epoxy primer isn't sandable. Pour the desired amounts of each into the can and stir thoroughly with the paint stick. It happens because of the wood grains that rise up when expose to any liquid. now guide coat and use your finner grits to block with The sealer should not be sanded. Make sure the car is completely dry before you start painting. Aluminum and stainless steel MUST be sanded with 150 to 220 grit dry sandpaper even if a metal prep or self etching primer is used. And here, primer is the trigger. Re-prime with primer surfacer and sand with 320 or 400 grit to smooth it out. then quickly go over that with some 220, then 2 more coats of 2k. Pour the paint mixture through the filter and into the bowl of the paint gun. However, a primer must be sanded before spraying paint over it. With my sheet sander, I use 150 grit. We have the parts you need to repair your tractor - the right parts. Once the wood is smooth, use a fine-grit sandpaper to lightly sand the surface. Bob may be using the 180 on previous coats of epoxy before applying spot filler. The primer is the foundation of the finish. Over Bare, Clean Metal Epoxy primers are amazing at sealing up bare metal and not allowing moisture or corrosion to creep in. This leaves no chance of rust or corrosion forming. It won't be easy if you introduce your own techniques and decide to sand it. If there is enough material I like to carry it to 600 grit but 400 wet will do. Without primer as a buffer, the shiny metal surface, whether old or new, won't bond with the paint well. Yes, sanding over primer before painting your car is necessary. 6. Use a primer especially designed for that type of door material. harmonp0103. Use some 400 grit and wet sand it gently. Most people prefer a finish to appear a bit brighter. It's not a process for everybody as you can easily gouge the drywall and cause a lot of damage. Step 6. Rough surfaces such as metal, floor wood, deck, rust metal, and hardwood should be sanded using coarse grit sandpaper (40-60grit). In this video we'll learn the best way to sand primer for painting. Also when painting, like others have pointed out, can raise little fibers from the drywall, going over the surface with a sheet of sandpaper can help get rid of those lose fibers. Step 3 Paint one coat of primer on the door carefully. Step 4. When smoothening plaster, sand the surface with a fine-grit sandpaper (80-120grit). Note that any imperfections that show in the primer will also show up in the color coat, so getting the primer really smooth is critical. The wait may be 30 minutes, 1 hour, or a day, depending on the temperature . Yes, you're encouraged to sand down your car after the primer is fully cured. Wait a couple of hours to allow the primer to dry. That causes problems in the long run. . How To Sand Primer Before Painting A Car . In the first place, it's difficult to get a crisp corner. Learning how to prep your primed surface for paint. Dry sanding epoxy will cause the sandpaper to be clogged . If you must sand the epoxy primer, we would recommend wet sanding it since this will be much easier. The best way to sand prime and paint wood is to first sand the wood with a medium-grit sandpaper to remove any roughness. This direct-to-metal primer is specifically ideal for use after sanding or media blasting projects due to its filling qualities. Avoiding sanding will create many ups and downs in the topcoat. Dont use any dish soap. It was formulated to be used without needing to be sanded. For instance, if the door is metal, use a metal primer. Usually 220 grit paper works well. Add Tip. As soon as the top layers of old . Unlike other types of sanding, wet sanding movements should be back and forth, in a straight line, rather than in circular motions. But even more troublesome is the tendency to scuff or gouge the opposite side of the . Featheredged areas should be final sanded with P280-P320 grade paper. 2. Choose your coarsest grit (600 if you are sanding primer or bodywork, 800-1000 if you are sanding a finished paint job). Hand sandin. The drying time of a primer depends on humidity levels, the existing temperatures, and the product manufacturer. Sand surface with 180 to 220 grit dry and re-clean surface. Do I spot prime with epoxy the sand through, then 2 or 3 coats of 2k high build urethane? Sanding after applying primer should help keep your surface as smooth and flat as possible, eliminating brush marks, or extra little globs. Spot in all the bare metal areas with epoxy, next day 2k all over,at least 3 coats, then another round of blocking. Please note that this takes a while! You can prevent any dust from settling on the car by grounding a wire from the car frame to a grounded object near the car. Use a sanding sponge for corners. With the rust removed, sand the entire surface to smooth out uneven areas and dull the surface so the primer and paint can adhere. You NEED a good scratch for bare. The coarse grit removes surface roughness and eliminates debris that impends paint flow when painting. When preparing metal for paint, checking for rust is important to make sure that the paint will adhere properly to the surface. Epoxy primer serves a wide range of automotive needs, providing quality resistance to corrosion, fast build, exceptional color holdout and strong adhesion to bare metal substrates. Sanding Primer Before Base Coat New Paint For cars Geoff Kuehn has . You do this because, frequently, priming brings about dips and uneven texture on your surface. Block sand the Primer Surfacer with P280-P320 grade paper using a sanding block until the guide coat is removed. Must not paint the surface and creates the ideal environment for the paint mixture through the filter into. 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