Gelcoat, depending on the current temperature and the thickness of the
gelcoat to start with, is quite viscous (but not always). Meaning that you
need to have a large nozzle if not pressure fed.

The only guns I have used are pressure fed to get the gelcoat out as quickly
as possible, due to the amount of time you have as much as anything else.

From memory (a while ago now), it goes something like this:

Measure or weigh required gelcoat into paint pot (making very sure that
everything is ready before adding catalyst)
Add correct catalyst
Put gun together and spray job ASAP
Average time in pot - no longer than 10-15 minutes
Immediately upon finishing spraying, clean gun and lines etc. This usually
takes longer than spraying the job (if you clean your gun right, it should
take longer)

If you think you can get all gelcoat out of your gun in 10-15 minutes then
clean it - go for it. BTW, just mixing fresh batches and putting them in
your gun is asking for trouble, mix once, clean once, start again (a lot of
mucking around) which is why I liked using a big brush or roller:-)

Rod.

"bruce" wrote in message
om...
I have a gravity fed spray gun which I use with spray putty. It has a
2.8 mm fluid nozzle. I was going to try and use it to spray some
"Gelcoat" but thought I should ask first - will this work. I thought
the nozzle size still might be to small. Hoe is a spray gun for use
with Gelcoat different from a normal spray gun??

thanks in advance.