cellulose over acrylic

[medlar]

I thought I could just spray high build straight on top of the barcoat?

So it would be acrylic thats on already- barcoat - celly high build - celly top coat

think we may be at crossed purposes here mate

Barcoat is an isolator primer, it stops reactions between incompatible paint types, once you spray the barcoat, you cannot flat it/ rub it down, the barcoat must stay intact, therefore you spray a primer over the top, as you say hi build,

So really you are spraying barcoat then your hi build primer then your colour coat, then possible a clear coat if using basecoat and laquer

 

[ross_m]

Haha sorry, I got myself confused there. Get it now

cheers

 

[ross_m]

OK, another question about barcoat

In this link it says its 1k http://www.u-pol.com/product-cat/80/barcoat™-quick-drying-isolator.htm

I thought 1k and celly dont mix?

 

[brightspark]

its barcoat u can spray it on household gloss then coat with celly or whatever u like without reaction

 

[N2ae86]

Wish that was true! Didnt work for me

Out of frustration and lack of time I barcoated over acrylic and then primed and painted - it started cracking up a few weeks later and progressivley got worse. I also sanded the crap out of a bumper to remove all traces of acrylic, then barcoated and then primed & painted. Still got a few reactions in areas.



Also make sure you strip and clean the gun out completely - the usual wash through you would do after spraying paint dosnt work. Bar coat clings to everything, including the insides of your gun, needle etc.

 

[ross_m]

Ok you have me worried now. Ive spoken to an ex- painter and he thinks it should work. Different oppinions from different people......

 

[jaykay]

could be your not letting things dry out properly,before going over it.

 

[ross_m]

Has anyone else who has reccomended barcoat in this thread had good results with barcoat over acrylic or any experience at all?..

I just bought 2 litres of it yesterday

 

[jaykay]

barcoat works ok.

 

[the snooper]

Wish that was true! Didnt work for me

Out of frustration and lack of time I barcoated over acrylic and then primed and painted - it started cracking up a few weeks later and progressivley got worse.

did you use it correctly

ie flat off the acrylic
give a decent coat of barcoatnot, not just a quick flash
waited an hour
didnt flat the barcoat
primed straight on top of barcoat

ive used this many time and it has always worked 100%

 

[the snooper]

Has anyone else who has reccomended barcoat in this thread had good results with barcoat over acrylic or any experience at all?..

I just bought 2 litres of it yesterday

works fine

give a good stir
dont thin
give a decent coat horizontal and verticle directions
let it dry for 1 hour
dont sand
prime it a decent coat so you can flat ready for top coat but dont rub through

and away you go

 

[ross_m]

Right, thanks. What do you suggest i flat the acrylic with. it says on the tin to use 400 wet n dry? That should do it eh?

 

[the snooper]

400 i think is a little course to paint over i usually finish with 800

 

[jaykay]

lack of time is your enemy.
i put it on just so it'd fully wet.but can see thru it most times.
remember you are sealing,not colouring with it.
and let it dry well.

 

[N2ae86]

did you use it correctly

ie flat off the acrylic
give a decent coat of barcoatnot, not just a quick flash
waited an hour
didnt flat the barcoat
primed straight on top of barcoat

ive used this many time and it has always worked 100%

Used it exactly as stated on the tin, sprayed on a hot day, a good coat but not thick and gave it a few days to dry – then primer and paint. 2 wings I used it on came out fine, the bumper and front lip are reacting, despite the epic sanding session I did to get rid of the old acrylic paint. Looked fine but over the space of a few weeks / months started to crack.

It’s probably just my amazing bad luck! You can’t believe how badly I regret using Halfords acrylic to do a few touch ups on those body parts. Bane of my life! Couple that with the fact that the new paint on the body has also gone to **** thanks to some random reaction I think the car is possibly cursed!

Going to paint it with a loo brush and my own faeces, see how that goes!

 

[Chickenjohn]

I should have posted earlier, but did not see this thread. Best thing you can do now is buy a big can of Nitromors and strip to bare metal with a scraper. Then when the nitromorsed paint is all removed and the panel left a day to dry (in the sun would be good) DA the panels and panel wipe throroughly , then etch prime, fill, prime and topcoat.

I think the problem with bar coats is that you need an extracted heated paint booth to ensure they dry. Fine for the pros. Best DIY way of dealing with incompatible paints is to strip to bare metal and start afresh.

 

[ross_m]

I cant strip it down. I have spent too much already on the prep work. Im going to have to just take a chance

Going back a few pages..

once you have applied the plastic primer to the fibreglass tailgate you can then paint it as you would any other panel.

Do you mean I can then spray it with high build then top coat or do I have to go straight to top coat?

 

[ross_m]

Ok so im painting tomorrow hopefully. Just another question... Is this way to do the tailgate :- Acrylic primer (already on) - barcoat - celly High build - celly top coat

Just not sure if the barcoat is flexible enough to be sprayed onto my fibreglass tailgate..

cheers

 

[series2]

I've used barcoat over coach paint (tekaloid) and it worked a treat. Barcoat is alcohol based and dries very quickly, also it's moisture sensitive (due to the alcohol).

another option is to use an epoxy primer, I've never had it react with anything, and you can put pretty much anything over it. Max Meyer (PPG) do a good epoxy, but dont let it go off in the gun!

 

[langy]

I was going to suggest Epoxy but presumed the thread starter wants to not use 2 pack products but it will do the job.