Hi
I tried KBS Rust seal (Satin black) for the first time today, with mixed results. I had some sandblasted car parts (disassembled wind screen wipers and some larger pieces), but because I'd handled them a bit, I decided to test the AquaKlean and RustBlast.
The first RustSeal coat went on nicely. All the brush marks smoothed right out, and I got a nice even finish. The parts were pretty fiddly to paint, so the jar I had transfered my stirred paint into was open for quite a while (maybe an hour). There wasnt too much left in the jar, so for the second coat, I used FRESH paint from my cling-wrap sealed tin (opened only while stirring & pouring).
I waited 3-4 hours before applying the second coat. To avoid spilling paint, I tried transferring the paint to a brand new jar using a clean 20mL disposable syringe.
The second coat did not work as well. The paint seemed not to stay evenly spread over the first coat. Even the paint on the walls of the jar (never before used) seemed to thin out to nothing in some spots, leaving small paint free circles behind. There were a few bubbles appearing while I was applying the paint too. This was essentially fresh paint. I have let this coat cure, but it doesnt have a nice surface like the first coat did. Its pretty streaky, as it didnt level out, and in parts doesnt completely cover the first coat.
I did first reuse the original brush, which I had given a quick clean with #1 thinner (it was dry and still soft). I thought this might have caused the problem, but I found a new brush, and got the same result. After starting I never handled the parts without gloves so I dont believe it was surface contamination.
Had it gone as planned, I would have applied KBS fusion within 6 hours and later put another UV resistant top coat over it.
I've watched the videos, and followed the instructions carefully, but I have quite a bit of this paint now, so want to make absolutely sure I use it properly!
So to my Q's....
* Any idea what might have caused the problem?
* To get a smooth final finish (before priming, top coating etc.), should I sand (400 grit?) and apply another coat of RustSeal?
More generally...
* Can subsequent coats still be applied sucessfully over fully cured RustSeal? I felt a bit pressured to apply a full second coat even though I wasnt confident that is was going on properly.
* Providing its not too humid and the second coat is applied within a few hours, can you use the same paint you originally poured out? Even if the lid's been off for a while? I cling-wrapped the remainder when first done, but eventually decided to use fresh paint for the second coat.
* Should a new brush be used for the second coat, even if the first was cleaned with the KBS thinners?
Regards,
Pat
