Post by oli on Nov 24, 2015 18:13:57 GMT 1
Whilst very much DIY, I had myself down as a a fairly competent sprayer. Nothing fancy, mainly wheels and trim etc but I've done a few touch up jobs and even a whole wing that looks decent even close up, but something is going seriously wrong and it's driving me mad!
I've been painting a winch bumper recently (after eventually removing the powder coating!) it's big and flat and angular, so should be a piece of p*ss, but everything keeps running!
I usually use Halfords paint from their mixing desk, which I know a lot of people don't like but their matches for my Epsom green discos have been perfect. I usually thin them to about 25 seconds through my mixing cup and it seems to spray fine. I presume this is enamel?
I recently tried to spray the bumper (after priming) with an enamel from Spraywell, which seems to have a very good reputation. I was advised to thin with 20% thinners. This seemed very thick through my cup at 40 seconds plus. It seemed to spray ok, but rather spattery, as opposed to misty and if you put enough on for it to go glossy (you know how all the dots suddenly merge and it develops a shine?) it seems to slowly sag and run!
It's also still tacky nearly 18 hours later!
I'm not sure where the problem is and as I'm self taught I'm not really sure what to change first.
Could it be -
Halfords actually isn't simple enamel and I've just become used to something else? Cellulose? (I have sprayed what certainly was enamel, but it was many years ago on an old tractor)
It's far too thick? (I thought things ran less if thicker - though this seems to sag, rather than run as such)
It's too cold? (I'm usually a fair weather sprayer!)
I'm using too low a pressure (about 30psi) or too much feed setting on the gun?
Something I haven't thought of?
Oli
I've been painting a winch bumper recently (after eventually removing the powder coating!) it's big and flat and angular, so should be a piece of p*ss, but everything keeps running!
I usually use Halfords paint from their mixing desk, which I know a lot of people don't like but their matches for my Epsom green discos have been perfect. I usually thin them to about 25 seconds through my mixing cup and it seems to spray fine. I presume this is enamel?
I recently tried to spray the bumper (after priming) with an enamel from Spraywell, which seems to have a very good reputation. I was advised to thin with 20% thinners. This seemed very thick through my cup at 40 seconds plus. It seemed to spray ok, but rather spattery, as opposed to misty and if you put enough on for it to go glossy (you know how all the dots suddenly merge and it develops a shine?) it seems to slowly sag and run!
It's also still tacky nearly 18 hours later!
I'm not sure where the problem is and as I'm self taught I'm not really sure what to change first.
Could it be -
Halfords actually isn't simple enamel and I've just become used to something else? Cellulose? (I have sprayed what certainly was enamel, but it was many years ago on an old tractor)
It's far too thick? (I thought things ran less if thicker - though this seems to sag, rather than run as such)
It's too cold? (I'm usually a fair weather sprayer!)
I'm using too low a pressure (about 30psi) or too much feed setting on the gun?
Something I haven't thought of?
Oli