HVLP Spraying Help

 

Question taken from http://woodworkingtalk.com

Hvlp spraying help ——————————————————————————–

I’m spraying an oil based primer. It seems like little speckles are coming out and creating an orange peel look. I thinned it with mineral spirits a little and added some penetrol. I have my air pressure set at around 8 psi. The paint seems to be leveling out alright but not perfectly smooth so I’m thinking there is something I can do to get it a little better. I’m thinking I should thin the primer a little more? Any help on spraying for beginners will be appreciated! Thanks

Here’s my tuppence!

A number of aspects need to be considered:
Temprature of spraying area, this will affect the flow (79 – 80 F).
Sieve the product using proprietry product or nylon stockings (ladies legs not in them at the time!).
The visco(u)sity – there will be an optimum flow rate for the product. Find out from your supplier/manufacturer and adjust accordingly. Use a viscousity cup. Product should travel a specified hieght in a specified time.
Check spray tip is appropriate diameter for product.
Make sure gun is thouroughly clean within.
If this all checks out increase pressure and build up using thinner coats and/or cut back with abrasives between coats.

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