Here’s a quick tip when painting those hard to mask parts like the groves on the Booster Covers and inside surfaces of Power Couplers.
I wanted to use rubber latex to mask of my parts but for the life of me I couldn’t find any in local stores. Short of time and rushing for C4 I came up with an alternative – Elmers Rubber Cement – which is made from mostly Latex. It’s readily available at most craft stores. It’s goes on clear so somewhat hard to apply as it’s hard to see where you’ve already covered.
If you can get Liquid Latex then I’d recommend using it – but in a pinch the Rubber Cement worked for me.