I am updating the lounge in our 1970's house and there are quite a few long cracks which need filling and there will be a smallish chase to fill. I stripped the wallpaper and coving off and have opened up the cracks with a shavehook. I have read on here that Toupret is one of the best fillers to use but am not sure which one of them to go for. Also should I prime the cracks with SBR and let it dry before filling?