Bolosun Posted March 9, 2018 Share Posted March 9, 2018 I am using Vallejo's light grey surface primer, to well prime my models using my airbrush. The issue I have is it keeps blocking my airbrush after approx 1/2 a cup. I have tried diluting it with Tamiya thinners 50/50 but still the same. Am I doing something wrong or can someone recommend another thinner I can use with my airbrush. The issue I have with the Tamiya primer from the can, is it stinks the house out. Cheers Dave Link to comment Share on other sites More sharing options...
bmwh548 Posted March 9, 2018 Share Posted March 9, 2018 What's the nozzle size? Is the air pressure ok? Maybe you could add some retarders? Link to comment Share on other sites More sharing options...
Bolosun Posted March 10, 2018 Author Share Posted March 10, 2018 13 hours ago, bmwh548 said: What's the nozzle size? Is the air pressure ok? Maybe you could add some retarders? Not sure on nozzle size, will check. Air pressure is fine for normal spraying; 2 bar. Retarders? Link to comment Share on other sites More sharing options...
PhoenixII Posted March 10, 2018 Share Posted March 10, 2018 Hi Dave, Retarders slow the paint drying, it's more of a problem with Acylics, as the paint's drying as it leaves the airbrush, so instead of a nice smooth finish you finish up 'pebble dashing'! or your airbrush clogged up. There are a number of proprietory brands, but Galleria artists retarder works well, the same as their matt, satin and gloss varnish, buy from an art shop, and it'll save you a fortune, bigger bottles! Air pressure, I would say it's too high at 2 bar, try it around 1 - 1.5 bar 15 - 21lb psi. Check your needle, first make sure it's:- a.) clean b.) straight c.) the right size. Recommended for acyrlics, 0.4mm. I know that Tamiya paint is a hybrid, but it has fairly small pigment and your using X-20. If you WANT to change thinners, give Mr.Color self levelling a go. If all else fails try enamels..............BUT, NOT indoors!! The wife'll have your guts for garters............... Paul Link to comment Share on other sites More sharing options...
Bolosun Posted March 10, 2018 Author Share Posted March 10, 2018 29 minutes ago, PhoenixII said: Hi Dave, Retarders slow the paint drying, it's more of a problem with Acylics, as the paint's drying as it leaves the airbrush, so instead of a nice smooth finish you finish up 'pebble dashing'! or your airbrush clogged up. There are a number of proprietory brands, but Galleria artists retarder works well, the same as their matt, satin and gloss varnish, buy from an art shop, and it'll save you a fortune, bigger bottles! Air pressure, I would say it's too high at 2 bar, try it around 1 - 1.5 bar 15 - 21lb psi. Check your needle, first make sure it's:- a.) clean b.) straight c.) the right size. Recommended for acyrlics, 0.4mm. I know that Tamiya paint is a hybrid, but it has fairly small pigment and your using X-20. If you WANT to change thinners, give Mr.Color self levelling a go. If all else fails try enamels..............BUT, NOT indoors!! The wife'll have your guts for garters............... Paul Cheers for the pointers Paul, I'll give it a try. Link to comment Share on other sites More sharing options...
planehazza Posted March 26, 2018 Share Posted March 26, 2018 (edited) On a slightly different subject, how long after applying UMP/Stynylrez primer can I apply the base colour? I always let the primer sit for ~30s, then hit it with just air to aid the drying/leveling. Am I safe to apply base colour after an hour, or is the "best to leave it 24 hours" a must? Edited March 26, 2018 by planehazza Link to comment Share on other sites More sharing options...
Matt_ Posted March 28, 2018 Share Posted March 28, 2018 I've also found the Vallejo primer can be quite prone to tip-dry. A little x20a and some flow-aid + retarder helps. If you decant the Tamiya primer into a pot, you can shoot it through the airbrush, which results in much less stink as you're not creating such a lot of overspray. Link to comment Share on other sites More sharing options...
nheather Posted March 29, 2018 Share Posted March 29, 2018 Nozzle size - I'm using Badger Stynylrez at the moment - the instructions state 0.4mm nozzle as a minimum - also that there is no need to thin it. Well I tried my luck in a 0.35mm nozzle - it kept blocking. Thinned it out a little, still kept blocking. Tried it in an old Badger 200 with 0.5mm nozzle and problem solved. I also thin it a little and seem to have no problems. Cheers, Nigel Link to comment Share on other sites More sharing options...
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