Rust-oleum primers

[supermanotorious]

Normally I use the gray automobile primer and find its almost impossible to over over spray and cleans up nicely with fine steel wool, this time around I tried the white clean metal primer since white primer makes the top color more brilliant, don't know if I've used it right, a few over spray runs and 48 hours until fully dry, the can says nothing about sanding it

the gray automobile primer is ready for dry sanding in just 4 hours

I take great care to spray paint correctly with many light coats several minutes apart but usually rush the primer since it cleaned up so well

was the white primer meant not to be sanded and I should've applied the same care as I would have with the final color?

I'll admit if I need more finesse with primer in order to avoid sanding I just may go this route

 

[devino246]

All paints have a respray window. This doesn't really matter when it comes to el cheepo spraypaints, but it sure as heck does when you get into automotive two-part paints. The respray window varies from paint to paint, but would be something like "recoat in within 2 hours, or after 36 hours". Basically, you want to either respray before the paint begins to cure, or after. Respraying before the paint cures doesn't require any prepwork; respraying afterwards does.

That gray automotive primer you've been using is sandable primer. Sandable primer is used to achieve a perfectly smooth surface, filling in small cracks, scratches and imperfections. A good auto body shop will spray a car with sandable primer, hand sand the car in its entirety, then basecoat and topcoat. The sandable primer and hand sanding ensures a perfect surface that would otherwise be nearly unobtainable on old metal.

So to answer your question, sanding isn't necessary unless you allow the paint to cure. Since you let the primer cure, go over it with some scotchbrite or 800+ grit sandpaper. It's not entirely necessary on sprainpaint (because, let's face it, spraypaint isn't worth a crap), but it'll help your topcoat bond better.

 

[dtsministroker]

Rust-Oleum Primers

I'm new to the forum and karting family & don't mean to but in, buy I have used this primer as recent as yesturdy and-- 15- 30 mins. to the touch & 1-2 huors can be handled... & must recoat within 1 huor OR after 48 hours...Also it will run easier in cool weather and take longer to dry....

 

[supermanotorious]

are you saying it's ok to spray the top coat during the respray time of the primer?

short of powder coat, what is better than spray paint? (ie paint gun plus paints locally available from Home Depot etc)

Respraying before the paint cures doesn't require any prepwork; respraying afterwards does.


So to answer your question, sanding isn't necessary unless you allow the paint to cure.

 

[dtsministroker]

Rust- olium primer

I agree with the other responde, recoat or top coat before paint cures & alot less headache,,I'm no pro but have watched pros and have painted several projects including a car & do not recomend spray can primers with base coat clear coat paints.. done that and paint job stunk. Your best bet other than powder coat is-- you can buy small cans of primer & ready to spray paints at Example-- Advance auto & spray it yourself.. That is my opinion only.

 

[devino246]

are you saying it's ok to spray the top coat during the respray time of the primer?

short of powder coat, what is better than spray paint? (ie paint gun plus paints locally available from Home Depot etc)

Yes.

Basically any two-part paint. Honestly, the price difference between the "consumer grade" paints and the more quality paints is too much for most people to consider using the higher quality paints. It's real easy to drop $150 on paint.

 

[dtsministroker]

consumer grade paint VS quality paint

I deffinately agree with you on the price you can pay for quality paint. I guess it depends on what you can afford and what level of kart you are building. Iwill soon find out as I'm now starting on mine as soon as I can find someone to help me ID my chases. New at karts and am listening to you and everyone who offers advise..So far it is an interesting hobby ..Later

 

[OzFab]

recoat or top coat before paint cures & alot less headache

The main difference is the finish. Recoating wet on wet saves time but can reduse the quality of the finish. Sanding between primer & top coat produces a much cleaner/smoother finish.

If you want to go to extremes, sand between each coat & you'll end up with a glass like finish but, it'll take you two weeks to achieve it

 

[supermanotorious]

well this one came out pretty good, the flourescent green was tough as it didn't coat very well and had a standard spray tip which started killing my finger after 3 cans, after that of course I hit it with clear enamel