HVLP Spray guns. Gravity or suction?

[froggy]

Im trying to get the things together to prime the bay and im going to be using a HVLP system do i need a gravity fed or a suction type spray gun?

 

[Nelly]

For the primer you need a suction spray gun with a large ish tip about 2mm, this is for a high build primer,
Then flat off and use a gravity feed with a 1.4mm tip for your w.o.w. primer and top coat. :wink:

 

[froggy]

Then flat off and use a gravity feed with a 1.4mm tip for your w.o.w. primer and top coat. :wink:

Stupid question buts whats w.o.w primer?

 

[T2-Nate]

Then flat off and use a gravity feed with a 1.4mm tip for your w.o.w. primer and top coat. :wink:

Stupid question buts whats w.o.w primer?

Wet on Wet? Meaning you can spray on your topcoat while the primer is still "sticky".

Not recommended for a perfect finish tho...

Personally I won't use a suction type spray gun because it's less economical (you can't suck up everything, a gravity-fed gun will shoot the last drop of paint.

Specialised body shops will still use them because they typically hold a lot of paint.
For home use just use a gravity gun and buy 1.3, 1,7, and 2.0 tips.

Mind you, I have only 2 years experience in bodywork (following a course) but this is how we're tought

 

[froggy]

Cheers, take it the 2.0mm tip would be for base primer, 1.7 for WOW primer and 1.4 for top coats, sort of makes sense.
Will try and get a gun with a 1.7mm nozzle as i'm not going back to bare metal.
The previous owner(s) painted over the top of the original paint but without any prep (the top coat is flaking off and the coat under this looks a lot better) so i'm planning on taking the top coat off and then prep and primer on top of what looks to be a decent base to start from.

 

[chippi]

go for gravity for low pressure you will get less overspray and less waste. 8)oh and buy the best you can afford

 

[ProfessorWheeto]

Buy gravity because its easier to clean for a start.

If you can stretch to it have a look at Finishline guns, they are made by DeVilbiss and good for the money.

Wet on wet isn't really needed if you haven't rubbed through your high build. It really is worth high building and flatting your high build twice. You can use black rattle cans as your guide coat.

The problem with wet on wet is if you get a run your stuffed basically, if you get a run in your top coat there is always the chance to flat and polish it out.