'Dulux Trade Wood-Primer Solvent Based' is alot better than 'Dulux Primer/Undercoat' to be honest. 'Dulux Primer/Undercoat' is suitable for when jobs are needing to be done very quickly. As you aint in hurry (i assume) then i would highly recomend you use 'Dulux Trade Wood-Primer Solvent Based' as it is better.