waxoil or underseal?

[lj]

nova needs something on the side what do u think is best?

[CP]

Underseal is ok if applied to a good painted surface that is rust free. If not all it does is seal in rust and moisture that carries on working away and ruining your car. Waxoyl is better but you need to get full even coverage as it doesn't spread into cracks it like clean oil does

[~~joycey~~]

i was also wondering this? with waxoyl is it better to brush it on or get the gun and spray it on?