Painting GRP

Get fed up of glow fuel eating my enamel model paint off cowls, etc. Has anyone had success with using two pack fuel proofer on top of enamels? Enamels such as Spectre and RC Colours, the latter great because they match Oracover/Profilm colours.

No response! So, I'll try experimenting with an old item.

Using my old broken chipmunk Cowl made of GRP (not pre-coloured plastic) which was painted with RC Colours Red No23. In the image below you can just make out a glow fuel run by the bubbled paint. The top section of the cowl was coated with two pack glossy AeroKote, brushed on so not that good a job. Allowed 24 hours to dry. The cowl was then lightly trickled on with glow fuel (10% nitro). Will now check every 24 hours for any changes. At present the AeroKote has not reacted with the RC enamel. I know this is not laboratory method but it will give some results to work from.

The results are looking positive. After 48 hrs of the cowl test area being damp with glow fuel and chemicals that have not evaporated away the glossy AeroKote has stayed intact with no visible signs of lifting or bubbling. Possibly a very slight change in the glossy surface but polished out okay.

The test used a grp cowl sprayed painted with RC Colours a few months ago. Glow fuel unwittingly left on the cowl softened the paint causing it to bubble up. An area of the cowl unaffected was lightly coated with two pack AeroKote fuel proofer. Left to dry/cure for 24 hours. Then glow fuel trickled on to the test area and left for 48 hours.

Although the test gives good results, long term fuel on the painted surface is not guaranteed, but at least a short period is viable. I had issues with fuel trickling out of the engine area, especially with four strokes, when the planes are in storage and hung up. Image added for a comparison