So due to my possible rust issue after using KBS I have done a bit of digging on my floorpan and also on the internet and thought would share with you my findings.

So we'll start with KBS. It's the Oz version of POR15 and made in Oz as far as I'm aware. I painted my Beetle floorpan in the stuff a few years back after shotblasting the pan and using the pre-paint guide of degrease and rust treat.
All went well on the bottom but the top got solvent flash off bubbles trapped in it due to the summer heat in the arvo

But apart from not looking smooth it seemed fine until I came to clean the floorpan this week ready for sound deadener. As per my previous tech thread it apeared as tho I had small rust spots appearing but the underside is perfect. So today I had at it with 80 grit paper in the sander. This KBS is like poop to a blanket as even the 80 grit took some to get through it. I also individually sanded some of the 'rust spots' and they smoothed out without breaking through the full depth of the KBS.

So, conclusion. My rust spots appear to have been made by metal particles from grinding and so I can conclude that KBS is some real touch shit

Now for POR15. I looked into this as was thinking I may have to shift brands if the KBS was at fault. Anyhow, from my online investigation it appears there have been a fair few instances of people having rust begin under the paint surface even after following the prep guide correctly. This put me off and so I just thought I'd let people know that KBS seems to be very good and it is cheaper than the imported POR15 so do your research people and made an informed choice

Oh, and a third option is Epoxy Mastic 121. An industrial strength primer/sealer/topcoat. Resistant to almost all automotive chemicals and pretty hard wearing/chip resistant. So this could be a good option too.

typical cause of rust reoccurring is poor condition in which the paint was applied, probably too much humidity and or cold or the metal wasn't dried long enough before applying the paint.


I typically heat the object and paint before applying any paint these days and I get perfect adhesion I also bake til its cures. or for some paints that don't like baking at least a dry warm-hot day works well.

I treat surfaces like NASA would, controlled environment, clean room, gloves, temperature ect.

I'm very cautous with my prep work too but was unlucky that the humidity had risen during the day when I did the top of the pan and hence the microbubbles.

Still as KBS is Australian and cheaper than POR15 then it helps give people a better choice of possible products to use. POR15 was the first on the mass DIY market just like Dynamat and people have just gone with it through popularity of use.

Now they have the option of a local product that's has good, if not better, as POR15 and will save them a bit of cash

I used Barmastic on my buggy - wouldn't touch POR15 again as it's part the reason why i had to replace my pan.....the Barmastic was as tough as nails,flexible and prep was minimal. I figured if it was good enough to use on oil rigs it was good enough for muh buggy

What I would love to get is the master series pretty much every one uses in the states, its 2 pak, finish is better than POR15 or KBS and is easier to use, sticks better and has know to have less sensitivity and problem with prep.

seen quite a few guys on the samba go with POR15 and then switch to master series without looking back.

problem is you can't get it here

http://www.masterseriescoatings.com/index/ 

Quote:

Originally posted by MickH I used Barmastic on my buggy - wouldn't touch POR15 again as it's part the reason why i had to replace my pan.....the Barmastic was as tough as nails,flexible and prep was minimal. I figured if it was good enough to use on oil rigs it was good enough for muh buggy

Barmastic sounds like epoxy mastic? Am I right?

Vlad, unfortunately we in Oz are limited with new products that Europe and USA have easy access too.

I'm gonna see how my rub down goes and if no surface rust is found under the KBS then another new coat of KBS will be applied cos trying to track down a good epoxy mastic or flexible hard wearing coating for metals is a frickin pain in Oz

Hey psimister, where do you buy your KBS? Been looking for a replacement for POR15

I used quite alot of por15 products on the hq about 7 years ago now , and can rate it too well. So am very curious to give KBS a try

I have used both and for the last resto I used Rust Bullet
POR is not UV stable and is a pain to top coat.
If doing it all again it would be Rust Bullet as the KBS didnt coat as good, thats the only complaint.

Quote:

Originally posted by psimitar Barmastic sounds like epoxy mastic? Am I right? Vlad, unfortunately we in Oz are limited with new products that Europe and USA have easy access too. I'm gonna see how my rub down goes and if no surface rust is found under the KBS then another new coat of KBS will be applied cos trying to track down a good epoxy mastic or flexible hard wearing coating for metals is a frickin pain in Oz

Quote:

Originally posted by vlad01 Quote: Originally posted by psimitar Barmastic sounds like epoxy mastic? Am I right? Vlad, unfortunately we in Oz are limited with new products that Europe and USA have easy access too. I'm gonna see how my rub down goes and if no surface rust is found under the KBS then another new coat of KBS will be applied cos trying to track down a good epoxy mastic or flexible hard wearing coating for metals is a frickin pain in Oz a lot of these products have a shelf life, so thats pretty much the reason we don't see many of them here and the limited market too won't help. the stuff would go off before it sold. hey did you use a moisture trap and line filters? if not that would be your most likely cause of the problems. Moisture cure epoxy and urethanes hate any traces of moisture in the air line. perhaps if enough people did a group buy to make he HAZMAT fees as transparent as possible we could import a bulk lot of quality produces fresh from the manufacture? An idea perhaps?

http://www.rustbullet.com.au/ 

I found this to be the easiest to use and yes i have also used POR and KBS

Yes thats one they use in the states a lot. I heard good things about it.

Shame rust bullet only comes in one colour and then requires a topcoat. KBS comes in different colours but if in sunlight will require a UV stable topcoat. Otherwise it yellows the colour but KBS say it doesn't affect the coatings structure. Only time would tell on that one

It doesnt need a top coat at all, it does only come in grey but is UV stable and wont discolour.


Rust Bullet requires little or NO surface preparation prior to application. Rust Bullet Products can be brushed, rolled, or sprayed over clean or rusted metal, as well as, many other substrates. No additional products such as etching primers or UV resistant topcoats are required as Rust Bullet has excellent adhesive properties and is UV Resistant. The surface protected with Rust Bullet will be scratch resistant, chip resistant, and chemical resistant. If the finished surface becomes chipped, rust will not spread and a simple touch up will re-seal the chip, providing fast, easy, low-cost maintenance, and continued protection. When properly applied, Rust Bullet’s unsurpassed rust and corrosion protection is guaranteed to last 10 years.

Because Rust Bullet is Resistant to Ultraviolet Light, applying a topcoat is not necessary. Rust Bullet is metallic gray in color; if a different color is desired, wait 24-48 hours after the application of the final coat of Rust Bullet before applying a topcoat of your choice. Rust Bullet’s BlackShell® Gloss Black Coating is formulated specifically as the optimum topcoat for use with Rust Bullet and Rust Bullet Automotive, providing the ultimate combination for rust prevention and surface protection. BlackShell® also provides outstanding protection when used as a standalone coating. BlackShell® has excellent rust inhibitive, abrasive resistant properties, resulting in a black glossy ultra smooth finish.

I have also use both Por 15 and KBS on my two cars.I found that the top Coats for the POR15 Doesn,t retain its gloss level.It looks like you haven,t washed the dirt of it.It also hasn,t got a High soild content in its top coat as I painted Three coats of yellow on top of the Tie coat's and you can still see the the grey under the yellow. Where KBS has in two years have retained its gloss level.The only problem is like someone already has mentioned is solved boil if applied in warmer weather or applied to heavy. KBS is better for the Money and less trouble.

So a week later I finally got a reply email from Rust Bullet Oz with pricing.

They also informed me that they are out of stock for the next 4-6 weeks until the next shipment arrives.

Glad I decided to buy a litre of KBS from Harts today

Too many options,
RB, Por15, KBS, Epoxy primer

How did your KBS go?

Quote:

Originally posted by Serious85 Too many options, RB, Por15, KBS, Epoxy primer How did your KBS go?

Cool thanks, KBS might be the go for now, I still have a few weeks to think about it though. I don't want to invest a ton of money in Rust Bullet then screw it up either.
Has anybody got any opinions about the electronic rust proofing? I know it wont help whats already there but might help to stop new rust from appearing.

doesn't work. just a marketing scam.

Lol ok thanks, i'll steer clear of it then.

I was thinking about buying one of the little sandblaster guns from supercheap, do you think these are ok, or will they be too weak?

Still affraid of what holes I may uncover