Best sealant? And painting full pony bodies?

[Truly]

Hello all! I was just wondering what are some really good sealants for custom ponies? I have mod podge but am unsure if it's good enough...
Also, I have another custom that needs full body recolouring and I cannot dye it, I want to try for a nice finish and in a lighter colour, would I gently use makeup sponges to do this? I don't have the space or funds for airbrushing yet sadly... Please help!

[Whippycorn]

You know, I was really doubtful about mod podge, but I have used it on a couple of customs now and it's actually not bad at all. Though most pros on here say Testors Dullcote is the best. 

For the FBR, I think the standard method is painting on many thin layers of paint, but I tried that once and got awful brush strokes. I have had some pretty good success with make-up sponged gradients and I'm pretty sure you could get a nice finish on a FBR that way. If your bait is darker than the colour you want, I'd prime it with a white coat first.

As an example, this girl's gradients were painted with a make-up sponge and sealed in modge podge.

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[kaoskat]

Pretty much what Whippycorn said. I don't have anything to add.