Usually you would use a progression of grits. For plastic body filler rough shaping you might use as coarse as 36 grit on an air-file, then smooth with 80 grit and finish with 220. Many techs skip the 220 for filler, but it means you will have to fill the sandscratches with putty after priming the first coat. For primer wet-sand with 220 wet-or-dry for the first coat or two, then 400, then 600. Tip: after you are finished sanding the filler, if you have time, let it sit for several hours. The filler shrinks a little during that time. If you prime and sand right away, the repair will sometimes telegraph through and be visible in the finished paint. If you allow it to do all the shrinking first, then the coats of primer will fill the shrinkage and do a much better job of hiding the repair. I have had jobs come back because the filler shrank AFTER I finished priming and sanding. Not pretty. POLYESTER PRIMER IS THE BEST.........so if your using going to use polysester primer then : start with 40 then 80 and that's it..........POLYESTER PRIMER WILL HIDE 80 GRIT SCRATCHES............ if you still want to sand your filler more....but dont want to take it down to much further....or you just want to fill some deeper scratches.....then palm sand with 120 and prime. BUT...... If you are going to use any other kind of primer over your filler.......you have to use more grits PERIOD...... ANY OR ALL OF THESE: 40 80 100 120 150 180 220
Sure just sand it first.
Sure just sand it first.
The best product to use is two-part epoxy primer, available from vrious manufacturers. It protects from corrosion, has excellent adhesion, and provides a good base for filler and paint. However, it is expensive. Alternately, you can use an acid etching primer, but you must remove this before appling filler, as the filler won't stick to it very well. It provides temporary corrosion resistance, but the vehicle should not be stored outside if this is all that is on it.
Sand the fiberglass with a 400 - 1000 grit sandpaper so you can not feel a difference between the fibergass filler and the body of the car. Now you can prime it.
Sand the fiberglass with a 400 - 1000 grit sandpaper so you can not feel a difference between the fibergass filler and the body of the car. Now you can prime it.
Many items are required for this process; Regular screwdriver, Phillips-head screwdriver, Channel locks or pliers, Grout or caulk removing tool, Masking tape, Industrial strength bathtub cleaner, Hydrofluoric acid, 120-grit waterproof sandpaper, vacuum, Acrylic tub body filler, Wide masking tape, Drop cloths, Waterproof epoxy primer, Aliphatic acrylic urethane and a Spray gun.
Car body filler is used for repairing auto body damage. Car body filler is also sometimes used for wood products as well even though it is intended for use on automobiles.
You must sand or grind off any paint or rust prior to using body filler because body filler will not adhere well to paint or any other contaminate.
Primer application is a part of the paint preparation.
You mean a small rough body part fixed... if that's what you mean you can do it yourself pretty quick and at a not to bad of a price... if its a pretty good dent get some Body Filler... depending on size, at Advance Auto Parts its like 9 dollars a quart or 17.77 a gallon...some sandpaper, some primer, masking tape, the right color of paint and clear coat... might cost you around 30-50 dollars to do it yourself which is what i prefur, nothing like the satisfaction in knowing you did it yourself and you did a good job... or go the body shop way which would cost afew hundred dollars.
Not necessary to paint but the primer will fade kinda quick.. so will the paint but not as fast unless you clear coat either the primer or paint then you should have any problem at all...AnswerIf you like the color of primer no you do not have to paint it but for extra protection a coat of paint will prevent rust.
The hole can be patches with replacement of the metal or with a body filler. a metal backing piece needs to be put in for the filler to have something to adhere to.