Re: Gouged Eye WIP
Posted: Sat Nov 04, 2017 8:04 pm
Varnish update for anyone intending to use 'Vallejo Polyurethane Matt Varnish'.
Think I've discovered that this stuff needs more than the recommended 24 hours to fully dry! When working on the models on Thursday the varnish was completely touch-dry, and I assumed fully cured as each coat had been given its 24 hour wait. I then went to work on them again tonight, and found that the varnished surfaces are now wet again! With it having been clearly reactivated in some way.
I'm guessing this is to do with the surfaces having been laid flat for the first time, whilst not yet fully dry. Perhaps the pressure from the weight of the models, or lack of air flow has caused whatever liquid was left to evaporate to somehow seep through instead. Not sure obviously, but with both coats of primer having been given 3 days each, I'm fairly certain the varnish is the sole culprit here.
Photo below. You can clearly see how milky some of the varnish has become from being reactivated. On Thursday this was literally jet black and bone dry!
Hopefully it will just fully dry out and wont need to removed and redone. Bit worried it might have to be if the first coat isn't fully set whilst sealed under the second. I'm going to try accelerate the drying with heat from a bulb or something and see if that helps. Anyone else happen to have used this stuff and had a similar experience?
Update (5/11/17)
Laying the models on their side overnight has reverted the varnish back to touch-dry. Going to leave them that way to hopefully fully dry, while I concentrate on getting the second half of the team up to the same state. With at least 3 days to dry between their coats! Once they're done, I'll stand this lot back up for a night and check if this happens again. If it still does after that long a wait, I'll just remove the varnish and redo the bloody things .
Think I've discovered that this stuff needs more than the recommended 24 hours to fully dry! When working on the models on Thursday the varnish was completely touch-dry, and I assumed fully cured as each coat had been given its 24 hour wait. I then went to work on them again tonight, and found that the varnished surfaces are now wet again! With it having been clearly reactivated in some way.
I'm guessing this is to do with the surfaces having been laid flat for the first time, whilst not yet fully dry. Perhaps the pressure from the weight of the models, or lack of air flow has caused whatever liquid was left to evaporate to somehow seep through instead. Not sure obviously, but with both coats of primer having been given 3 days each, I'm fairly certain the varnish is the sole culprit here.
Photo below. You can clearly see how milky some of the varnish has become from being reactivated. On Thursday this was literally jet black and bone dry!
Hopefully it will just fully dry out and wont need to removed and redone. Bit worried it might have to be if the first coat isn't fully set whilst sealed under the second. I'm going to try accelerate the drying with heat from a bulb or something and see if that helps. Anyone else happen to have used this stuff and had a similar experience?
Update (5/11/17)
Laying the models on their side overnight has reverted the varnish back to touch-dry. Going to leave them that way to hopefully fully dry, while I concentrate on getting the second half of the team up to the same state. With at least 3 days to dry between their coats! Once they're done, I'll stand this lot back up for a night and check if this happens again. If it still does after that long a wait, I'll just remove the varnish and redo the bloody things .