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Spraying dope with HVLP
Posted: Mon Aug 03, 2020 11:33 am
by ColinC
Hi,
Does anyone have any experience spraying coloured dope using HVLP? Just wondering how easy/practical it is.
Regards,
Colin
Re: Spraying dope with HVLP
Posted: Tue Aug 04, 2020 12:25 pm
by mike newall
Depends which system you are referring to.
Either way, it sprays fine.
I am talking the difference between a turbine sprayer and an air line fed one. They both run a similar gun, should be about 1.2 or 1.3mm nozzle. The only thing I would want to ensure with the turbine unit is has it got protection for sparks present in a potentially combustible atmosphere.
They both should run at about 40psi and provide much reduced paint usage and over-spray. Thing with dope is make sure your environment is dry or use blushing retarder as it tends to blush if not. Not the end of the world, it polishes out.
I have sprayed dope and rolled dope using a fluffy roller - worked very well, but you need to keep moving as it dries quickly.
If it is a build coat and you intend to finish with a polyurethane finish, stay with nitrate chemistry, do not swap to butyrate as the top coat won't adhere as well. If you are finishing as a satin finish (the best imho) then transition to butyrate after the silver.