daedalusminos
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Looks like dust. Are you using a lint free cloth with the panel wipe? I'd also try finishing with a tack rag just prior to spraying.
much higher pressure /volumes of air vs an aerosol
are you wearing a new paper suit? opening the door between coats ? wet floor ?
Thanks for the PDF on the Lechler data sheet it says viscosity for 20 degrees celcius at 22 - 30 FC4. Ani idea what FC4 is? Doesn't seem to appear on the PDFThere are no "these setting work with your spraygun" as a beginer following the procedure of setting the spraygun up helps. When spraying onto paper its easy to see when you get to the point where opening the fluid control causes the paint to run rather than produce a nice even spray pattern. A lot will depend on the viscosity of the paint and the air pressure you use, adjust one thing i.e the paint to thick and it will make a big differnce to how the spraygun is set up.
Get a viscosity cup and thin the primer to get the viscosity to what the paint manufacturer recomends. They include it on the data sheet for a reason, be careful though, make sure what system the paint manufacturer uses. Some will specify din 4 whilst it looks like lechler for the primer dont. A lot of viscosity cups are ford 4 and need different timing to achieve the desired viscosity. See attached pdf for conversion between different systems.
no wonder if its outside ...i used to get bits in the paint in a proper boothThe last few attempts have been outside. I will try painting in the booth again soon. When it comes to wetting the floor is it considered suitable to run a mop over the floor with a fair amount of excess water?
As said, I never used to encounter any dust when spraying via aerosol at all, and the same environments were used. I grant you it could be dust but where on earth is it coming from??Looks like dust to me.
Even with the best set up you will always get some, but you can cut and buff it out easily.
Obviously not on that panel until you sort the sand scratches, of course.
Ok, thanks for clearing that upFC4 is I believe Ford cup 4 so Ford 4 on the chart
are u using a water trap/filter......just sometimes the airline is dirty inside.....
I always kept a new one just for spraying....plus 2 water traps for saftey....
Have picked at the lumps...? is it solid or hollow....solid is dirt of some sort, hollow is usually water droplet.....
aerosol is very low pressure ...just mists on , the spray gun will be stirring things up moreAs said, I never used to encounter any dust when spraying via aerosol at all, and the same environments were used. I grant you it could be dust but where on earth is it coming from??
I believe they're lint free. I've used microfibre and regular 100 % cotton cloths so far. I'll give the tack rag a goLooks like dust. Are you using a lint free cloth with the panel wipe? I'd also try finishing with a tack rag just prior to spraying.
Ok, I'll make sure the floor is properly before the next attempt.no wonder if its outside ...i used to get bits in the paint in a proper booth
do whatever you need to so the floor is wet ...mop /watering can and a broom
dont worry too much over a few specs in the primer , it sands out and theres other things to worry about that matter more
You reckon this dust is coming up from the floor then? Should I wet the walls and ceiling too just be safe, it is a small boothaerosol is very low pressure ...just mists on , the spray gun will be stirring things up more
keep stepping up your cleaning routine until you get the results you need to seeYou reckon this dust is coming up from the floor then? Should I wet the walls and ceiling too just be safe, it is a small booth
blue paper towel is what we use ...wipe with a soaking wet one and follow with a dry towel in the other hand , dont wet it and let it dryI believe they're lint free. I've used microfibre and regular 100 % cotton cloths so far. I'll give the tack rag a go
Thanks for the information there Phil I do use paint strainers after mixing the paint and before emptying into the gun cup. I believe I have got the right fan shape, paint delivery and travel speed. The overall finish after it's flashed is very good, it's just these damn particles in the surface of the painted surface that are bothering me. I haven't got viscosity cup as yet, but one will arrive soon. I did thin the paint to your recommendation though. Don't get me wrong, I am enjoying learning this new skill despite all the clean and process that's involvedDont think that is dust, too big! Lumps in the paint. I use a Lidl gravity gun for everyday painting, and never sweat over the setup! It has a paint filter in the bottom of the cup, but NEVER put paint in the gun without filtering it, even using a bit of muslin, but proper paint filters are so cheap anyway. I used a two pack high build primer called lesonal in the seventies, I think the one you are using is the same. Thin the paint to the consistency of creamy milk or slightly thicker. Before you start on the panel set the fan size by spraying onto a large piece of cardboard, and set the fan so that you get a band of paint which is even density top to bottom, and doesnt feather out. Keep the gun parralell to the panel and watch the "wet edge" as you lay the paint on. adjust your speed of travel until you can lay the paint on in a coat just thick enough for the orange peel to melt away but no thicker. Always pull the trigger fully open and adjust the material setting and travel speed until you get to a point where with full trigger depression the gun is giving just enough paint to melt into a smooth finish, then use travel speed to fine tune! Spraying is a matter of PRACTICE, and getting the consistency of the paint right! If you always thin to the creamy milk consistency you will not need to reset the spraygun settings, I rarely touch mine. I never use my best guns for spraying primers, as the fillers in the primer tends to wear the needles and jets, but this really only applies if you are painting a lot! Don't be afraid to carefully strip the gun and check it for cleanliness, and always clean your paint stirrers and stir right to the bottom of the can every time you open it! You are making it hard for yourself by practicing on a less than perfect surface, you need to flat out all the imperfections so you can concentrate on watching the paint go on, and as you practice practice practice you develop the skill! Very much like welding, it is not hard, but requires concentration and practice for good results, did I mention that?
Good luck!
Phil
Thanks for the info, I'll clean the booth to the best of my ability before the next attempt.keep stepping up your cleaning routine until you get the results you need to see
needs blowing out including the walls , ceiling etc , new overall out of the packet , strain everything , gun filter
i still say youre worrying over nothing ...if a few dust nibs in the primer is all thats going wrong it isnt too bad ...and why spend hours cleaning when youre going to sand it off anyway?
So it's because the steel panel is charged with static that it's drawing dust to it?in an ideal world yeah you wouldnt get any
diy'er painting outside or in a fancy shed ..yeah you will get a few bits , used to have some radioactive air gun thing in the 90s that stopped a panel being charged with static , you should see how some older bumpers behaved they was like a magent
mostly plastic parts ...it can happen ive heard of painters using ground straps to helpSo it's because the steel panel is charged with static that it's drawing dust to it?