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I hate painting bumpers it's official!

2K views 15 replies 7 participants last post by  kingjames2306 
#1 ·
Alright so I got new bumpers and flares and they shipped bare steel....I tried monsterliner and **** was awful so I stripped it off (sucked). Now I went with rustoleum spray bed liner. I sanded the surfaces, cleaned with mineral spirits, and did 4 coats of self etching primer. Then I did on e light coat of bedliner to start. 3 days later I tapped it with a screw driver and it chips.. Now I'm angry haha....is this because its just one light coat? Or is it just not going to work. I don't want to go spend more money on paint to be wasted. Any help would be great!
 
#3 ·
Im interested to know why the monstaliner sucked. Im asking since Im also painting bumpers, tried the duplicolor bed liner, worked out ok. Also tried a regular gloss black with a clear coat, turns out really nice, just a lot of work with wet sanding/buffing and stuff
 
#5 ·
No single part paint will have the durability of a two part paint. If it comes in a rattle can, it will come off. That said, I have decent luck with the Duplicolor Bedliner in a can. Scratches and chips touch up easy and if need be it can be stripped easily enough.
 
#8 ·
kingjames2306 said:
after you cleaned it with mineral spirits did you wash the parts off thoroughly with water? Some primers won't work with bedliners and won't adhere good. When it comes to bedliners you're only as good as what you're adhering to.
Mineral spirits are oil based, never wipe a part to be painted with mineral spirits.
 
#9 ·
This is incorrect. Mineral spirits is a solvent and will leave no residuals on surfaces. It may not be strong enough to remove heavy oils and contaminants but it will never contribute to adhesion problems. The reason it's not used for cleaning in automotive paint situations is that it evaporates very slow and has weak solvency. I sell industrial paints to many customers that use mineral spirits to clean metal before painting and they have no problems
 
#10 ·
magnetman said:
This is incorrect. Mineral spirits is a solvent and will leave no residuals on surfaces. It may not be strong enough to remove heavy oils and contaminants but it will never contribute to adhesion problems. The reason it's not used for cleaning in automotive paint situations is that it evaporates very slow and has weak solvency. I sell industrial paints to many customers that use mineral spirits to clean metal before painting and they have no problems
Sorry, mineral spirits are petroleum based. Petroleum= oil. Why do you think its used to thin oil based paints.
 
#11 ·
So what if it's used to thin oil base paints? It has many other uses including cleaning of metal and other surfaces.
Just because something starts from oil does not mean it is oily or still contains oil. There are many things that start from petroleum and no longer resemble it.

Who told you what you're saying?
 
#12 ·
magnetman said:
So what if it's used to thin oil base paints? It has many other uses including cleaning of metal and other surfaces.
Just because something starts from oil does not mean it is oily or still contains oil. There are many things that start from petroleum and no longer resemble it.

Who told you what you're saying?
Dude, its oil based. You dont use stuff thats oil based in automotive painting. You can even feel the residue it leaves on yer hands. Why do you think everything is solvent based in the automotive paint field
 
#14 ·
magnetman said:
Never mind man :D
You paint, I manufacture paint and I purchase thousands of gallons of mineral spirits at a time. The MS I buy leaves no residue on my hands so I don't know what kind of stuff you have used
Great, and in my shop theres no petroleum based products that are or ever will be used for cleaning prior to paint. You can make all the paint you want, but petroleum and anything petroleum based doesnt mix with car paint. If it did there would be no need for lacquer thinner or wax and grease remover. Think what you want, mineral spirits shouldnt be used to pre clean for paint.
 
#15 ·
You are misinterpreting "petroleum product' with the thought of oil

Almost everything is a petroleum product

Acetone
Toluene
Xylene
Benzine
Mineral Spirts, etc are all petroleum products and originate from fossil fuels, petroleum, natural gas and coal

Lacquer thinner contains a large amount of toluene and benzine, both petroleum products

Before the current wave of environmental regulations came into place almost all automotive Grease & wax removers contained a very large amount of VM & P Naptha... another petroleum product very similar to mineral spirits.
 
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