Airframes
Benevolens Magister
Bit of a tricky one, as it seems you're using propellant cans. I think I would try the following.
Get some Johnson's Klear (now known as Johnson's Pledge Klear in the UK), and brush paint a small area on the underside, where it's pebble dashed, as a test. The Klear will find its own level and dry smooth, without brush marks. Any excess will collect at sharp edges, such as a wing trailing edge. A large drop can be removed immediately with a wet paint brush, and smaller 'collections' wicked off with the edge of a piece of kitchen towel tissue (NOT toilet tissue).
This should start to cover the pebble dash and, if it looks promising, give a second coat to this area and let dry. Repeat if needed. If it's ok, then do the whole model in the same way.
The effect has almost certainly been caused by pressure drop in the can, so a compressor is the answer. Have a look at Model Hobbies, and especialyy evertyhingairbrush.com, the latter having a cheap compressor which is adequate for the average modelling job, and costs about the same as four propellant cans.
Get some Johnson's Klear (now known as Johnson's Pledge Klear in the UK), and brush paint a small area on the underside, where it's pebble dashed, as a test. The Klear will find its own level and dry smooth, without brush marks. Any excess will collect at sharp edges, such as a wing trailing edge. A large drop can be removed immediately with a wet paint brush, and smaller 'collections' wicked off with the edge of a piece of kitchen towel tissue (NOT toilet tissue).
This should start to cover the pebble dash and, if it looks promising, give a second coat to this area and let dry. Repeat if needed. If it's ok, then do the whole model in the same way.
The effect has almost certainly been caused by pressure drop in the can, so a compressor is the answer. Have a look at Model Hobbies, and especialyy evertyhingairbrush.com, the latter having a cheap compressor which is adequate for the average modelling job, and costs about the same as four propellant cans.